[ 4 ] 
found in the Danube and rivers of Mufcovy. WiJ- 
lughby and others inform us, that it is made of the 
found of the * Beluga j Cafpar Newman that it is 
made of the Hufo Germanorum and other fifh, which 
he has feen frequently fold in the public markets of 
Vienna. Thefe circumhances make it appear the 
more extraordinary, that a perfect account of the 
manufacture of fuch an ehential article of commerce 
fhould remain fo long unrevealed. 
In my firtt attempts to difcover the conhituent 
parts and manufacture of ifinglafs, relying too much 
upon the authority of fome chemical authors, whole 
veracity I had experienced in many other inhances,. 
I found myfelf conhantly difappointed. Glue, not 
ifinglafs, was the refult of every procefs j and al- 
though, in the fame view, a journey to Rufiia proved 
fruitlefs, yet a heady perfeverance in the refearch. 
proved not only fuccefsful as to this objeCt, but, in. 
the purfuit to difcover a refinous matter plentifully 
procureable in the •f' Britifh fifheries, which has been 
found, by ample experience, to anfwer fimilar 
purpofes. It is now no longer a fecret that our 
J lakes and rivers in North America are hocked 
* Vide Specimen Hiftor. Nat. Volg. Auctore j. R. Forfler, 
Philof. Tranf. 1767. 
f Upwards of forty tons of Britifh ifinglafs have been manu- 
factured and confirmed fince this difcovery was firft made. 
J As the lakes of Noith America lie nearly in the fame lati- 
tude with the Cafpian Sea, particularly Lake Supeiior, which 
is Laid to be of greater extent, it was conjtCfured they might 
abound with the fame forts of iifh, and, in confequence of 
public advertif ments diftributed in various parts of North Ame- 
rica, offering premiums for the founds of ifurgeon, and other 
filh, for the purpofe of making ifinglafs, feveral fpecimens of fine 
with 
