438 ADDENDA. 
works. Indeed, all the fyftems we have are fo 
brief and indiftin@, that even the moft expert 
naturalift will fometimes be at a lofs to difcover 
whether the animal there pained is pa! the ob- 
jet of his fearch. 
It is the Oe/ri that depofit their eggs in the 
fin of cattle ; and great pain is occafioned to the 
animal by the fwelling of tumours, which include 
the larva of the infect. Af/i are a different genus 
of flies. 
P. 84.—Since the note on the torpidity of | 
fifhes, I obferve that the fat is confirmed by 
late obfervations, which will be found in Ceprpg 
Hiftcire Naturelle des Poiffons, ‘Yom. 3. Paris 
1802. ‘ Formerly we had vague ideas concetn- 
‘ing mackrel in their fub-marine afylums during 
‘ winter, and particularly in the polar regions ; 
* but we are now indebted to vice Admiral. Ple. 
‘ ville le Peley, for certain information. He has 
‘verified his obfervations along the. coaft a 
‘ Greenland, Hudfon’s Bay, and, towards the 
‘banks of Newfoundland. In thefe northern 
“ countries are arms of the fea, named daracho- 
© vas, which are fo interfected by points. crofling 
‘ them, that at all times the water is as calm ag 
fin abafin. The depth of thee places is va. 
* rious, 
