Just for the amusement, and i hope John Downing would not mind:

CATGUT:  COMM. 1567 REVISITED



A basic assumption today is that all lute strings of the 16th and 17th C were 
made from ‘gut’- invariably taken to mean the intestines of a lamb or sheep. 
Yet, historical references to lute string materials are rare and, when they do 
occur, include materials other than the intestinal fibre of sheep. 

Robert Dowland (1610) and Mace – the two most often quoted historical sources 
concerning lute strings – make no mention at all about the materials used for 
fabricating strings. Margaret Board (1660 – 1672) does. She says that lute 
strings were made from “Sheepes and Catts gutte”. Board is clearly making a 
distinction between sheep’s gut and a material called catgut.(1)



So what was catgut?



Samuel Pepys was an angler of sorts. An entry in his diary for January 
1659/1660 records that “This day Mr Caesar told me a pretty experiment of his, 
of angling with a minikin, a gut string varnished over which keeps it from 
swelling and is beyond any hair for strength and smallness. The secret I like 
mightily!” (Comm. 1567).



Pepys was using angling terminology.

Early records confirm that anglers made their fishing lines from horsehair (2). 
The final connection between line and hook had to be a fine, strong, 
transparent line, invisible to a fish. This short length of line, known as a 
‘cast’ or ‘leader’ was usually made from white horsehair  - referred to by 
anglers, simply, as ‘hair.’

Horsehair used in commerce today – taken from the tail of the animal – measures 
from 0.003 to 0.011 inches in diameter. Its diameter and strength depend upon 
the breed of horse and its diet.



We know, from the writings of Thomas Mace (1676), that strings called 
‘minikins’ were used for lute 1st, 2nd, and 3rd courses as well as for small 
octave strings (particularly the 6th octave).

Pepsy’s minikin string was “ beyond any hair for strength and smallness”, so 
either lute treble strings in the 17th C were a lot smaller in diameter than we 
imagine today or horsehair available to anglers of the period was quite a bit 
larger in diameter (and stronger) than is generally obtainable today. I believe 
the latter proposition to be the case.



During the first quarter of the 18th C, an innovative material for freshwater 
fishermen came on to the market.

The new material, that was to eventually replace horsehair for leaders - as 
best quality horsehair became increasingly difficult to obtain - was a 
transparent, monofilament line of silk known as ‘silkworm gut’- or just ‘gut’ 
to fishermen.

According to Herd (3), silkworm gut was first advertised for sale to anglers in 
1722 and the first angling book to describe the manufacture and use of silkworm 
gut for leaders was “The Compleat Fisherman” by James  Saunders published in 
1724. In his book, Saunders makes direct comparison between silkworm gut (used 
for angling) and catgut (used for viols and violins). He also confirms that 
these strings ‘resembled a single hair’ (4).





SILK FILAMENT AND SILKWORM GUT



Silk filament, used for making silk fabric, is produced by the caterpillar of 
the ‘Bombyx Mori’ moth domesticated for this purpose by the Chinese – way back 
in the mists of antiquity. The caterpillar spins a cocoon, prior to pupation, 
containing a continuous double filament of silk around 3000 to 4000 yards (2800 
to 3700 metres) in length - each filament being about 0.001 inch (0.025 mm) in 
diameter. This strong, fine filament, after treatment and twisting into thread, 
was used, not only for weaving into silk fabric, but also for making articles 
such as bow strings and musical instrument strings used in Middle and Far 
Eastern cultures (5).

The technology required for silk production was introduced to the Middle East 
before 600 A.D.  By the 11th C, the Arabs had established the industry in North 
Africa, Spain and Sicily. Italy was to follow in the 12th C. By the 16th C, 
France had become a major centre for silk production.



 Silkworm gut – known to the Chinese centuries before it became generally 
available in Europe – is a by-product of the silk industry.

At maturity, the caterpillar of the silkworm moth measures about 3 inches long 
by about 0.375 inches in diameter. The silk is produced in two sacs - weighing 
about 25% of total body weight

Silkworm gut - prepared for use as angling leaders - is made by soaking the 
mature caterpillar in vinegar to kill it and to condition the contents of the 
sac. The caterpillar is then split open and each sac is stretched and set on a 
frame to dry – the more each sac is stretched, the smaller is the diameter of 
the strand produced. After cleaning, the strands are graded according to 
quality and diameter. A further refinement is to pass the strands through 
sizing dies in order to produce precise and consistent diameters. These are 
known as ‘drawn’ gut strands.



                                          ***************************



By the 19th C, the manufacture of gut leaders for angling was big business – 
the finest quality product being manufactured in Spain. Leaders were made in 
lengths ranging from 10 inches to 20 inches and diameters from 0.22 inches to 
0.007 inches. However, it was possible to make longer strands in the smaller 
diameters but these were more expensive to produce and not generally required 
by anglers.

Silkworm gut continued to be produced in quantity until nylon monofilament 
became generally available in the 1950’s.



“Making and Using the Dry Fly – With Valuable Notes on Leaders and Stream 
Tactics” was published in 1934. Author Paul H. Young, a noted flyfisherman of 
the time, refers in his book to the process of making silkworm gut for leaders. 
In his book he states that silkworm gut was also known as “catgut” meaning 
“caterpillar gut”.

 The question is - was this etymological connection noted by Young simply an 
assumption on his part, or was he making reference (as he implies) to 
terminology familiar to some anglers? Have fishermen known all along that 
‘catgut’ was not made from the intestines of a sheep (or a feline!) but from 
the ‘gut’ of a silkworm? 



The seaweed CHORDA FILUM, which is common worldwide, is a type of kelp of 
economic importance as a food and for making medicines. This weed occurs as a 
long strand up to 6mm in diameter and 4 metres long, and is found in rock pools 
and shallow sheltered bays.

Chorda Filum is commonly known as, sea lace, mermaid’s tresses, sea lamprey, 
young man’s net, lucky minnies lines, mermaid’s fishing line, dead man’s rope 
and sea bootlace.

Scottish fishermen, after stripping away the fleshy outer coating of the weed, 
used it as a tough cord for making fishing lines, nets and ropes. Chorda Filum 
was also known as “CATGUT” – because it resembled in appearance and function 
the “gut” strands used by freshwater fishermen for their leaders(?).



According to the Oxford English Dictionary, the origin of the word 
“caterpillar” comes from the Old French ‘Chatepelose’ meaning “hairy cat” which 
in turn became ‘ chate – piller’ meaning “pillaging cat” before the final 
corruption ‘caterpillar’ which was adopted by Johnson in his “Dictionary of the 
English Language” of 1755.

The naming of hairy caterpillars as ‘cats’ also occurs in other European folk 
cultures.



>From another perspective, the botanical word ‘CATKIN’ has nothing at all to do 
>with felines. Catkins are so called because they look like little hairy 
>caterpillars!



In summary, it would seem from this evidence to be quite probable that musical 
instrument strings with names like “catgut” and “catline” were not made from 
the intestines of a feline animal (everyone knows that!) but were either 
twisted from silk filament or were an artificially produced silk monofilament 
strand – both being perceived as being a product of the ‘bowels’ of a silkworm 
caterpillar. 

In all likelihood, the ‘minikins’ of Mace and Pepys were monofilament silk.



 In Comm. 1442, I proposed that catlines might have been overspun strings made 
from sinew fibre – rather like the nylon overspun strings made for modern 
classical guitar third strings today. (6) 

Alexander Rakov (Comm. 1744) had a better idea. He has, recently, been making 
twisted and overspun strings of this type from silk filament (as well as 
alternative fibrous materials) for bowed and plucked instruments – and they do 
work!



Earlier this year, Alexander contacted me and kindly sent some of his 
experimental strings for testing on one of my lutes (a Hieber copy, 60cm string 
length, strung with octave basses). These trials are not complete but the 
results, so far, are very encouraging.

The observations in this Comm. were researched and developed from our original  
(and still ongoing) discussions concerning silk technology and instrument 
strings.









NOTES



(1)   The first known reference to catgut as a musical instrument string is in 
1599              according to Segerman (Comm. 15).







(2) The earliest angling books in the English language are “A Treatyse of      
Fysshyngewith an Angle”, published in 1496 by Wynkyn de Worde (Caxton’s 
successor) and “The Arte of Angling” by William Samuel published in 1577. 



(3) Dr Andrew Herd, a family practitioner and flyfishing enthusiast and 
historian has just published his book “A History of Fly Fishing” and a 
republication of “The Treatyse of Fishing with an Angle” (Medlar Press, The 
Grange, Ellesmere, Shropshire, U.K.). Andrew has very kindly provided me with 
information from his book about silkworm gut manufacture and use, seen from an 
angler’s perspective.



(4) It is likely that silkworm gut (for anglers) and catgut (for musical 
instruments) was the same material, (made from the silk sac of a silkworm 
caterpillar) but that each was prepared in a different manner. Catgut was 
silkworm gut preserved in oil to keep it flexible. Angling leaders, however, 
were oil free - prepared for use by soaking in water to make them flexible. (at 
least, this was more recent angling practice – not mentioned by Saunders, 
however).



(5) Asian and Turkish bows were generally of the reflex type – short and very 
powerful. The bowstrings were made from untwisted silk filaments (for maximum 
tensile strength) bound together with cotton thread wrappings



(6) For further information on alternative string materials, construction and 
other related topics, see Comms 1318, 1319, 1320, 1352, 1393, 1394, 1395 and 
1441 (Downing) and Comms. 1288, 1350, 1351, 1417, and 1466 (Peruffo). 



On Mon, 27 Dec 2010 17:50:41 +0000
Ron Andrico <praelu...@hotmail.com> wrote:

>    Then there is the reference to caterpillars that produce silk...
>    RA
>    > Date: Mon, 27 Dec 2010 08:29:34 -0800



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