[ »4 3 
of ruga, adheres fo firmly to the external mem- 
brane, which is ufelefs, that the labour of feparating 
them fuperfedes the advantage. The inteftines, how- 
ever, which in the larger fith extend feveral yards in 
length, being cleanfed from their mucus, and dried, 
were found furprizingly firong and elaftic, re- 
fembling cords made with the inteftines of other ani- 
mals, commonly called cat-gut, and, from fome 
trials, promifed fuperior advantages, when applied 
to mechanic operations. 
Having now fufficiently revealed the principal ar- 
cana in the manufacture of ifinglafs, and explained 
fome of its leaft known phasnomena and properties, 
the farther profecution thereof, as a commercial bufi- 
nefs, is left to others, whofe future inquiries into the 
fubjeCt, it is hoped, will, in fome refpeCt, be anti- 
cipated through this narrative ; but whatever fuccefs 
may attend the attempt, I flatter myfelf to ftand 
acquitted, in having contributed every thing in my 
power to its advancement and perfection. 
Explanation 
