Dr. scuwr.niAWEft’s Account 
Macrocephalus, mixed with' feme indigeftible relics of its 
food ! ^ i • » * * * j * •' t * 
There now remains only one objeSion to be obviated on this 
fubieel, and this relates to the chemical analyfis of ambergnfe . 
Neumann obtained from one drachm of ambergnle five grams 
of an acid phlegm, two fcruples and an half of empyreumatic 
oil, and two grains of a volatile acid fait in a cyftalhne form. 
Now if all ambergrife owes its origin to the animal kingdom 
in the manner we have ftated, how are we to account for the 
acid obtained from it by diftillation ? Would not ambergnfe, if 
it was really of an animal nature, like all other feces of aim 
feeding upon animal food, yield a volatile alkali? I confefs this 
leems to be a material objeaion ; but I reply to it, lr , a 
although my experiments made upon unadulterated ambergnle 
confirm thofe made by NEUMANN, grim, erowne, and geof- 
froy; yet from that analyfis it does, in my opinion, by no 
means follow, that ambergrife is not an animal produd. 
Two eminent chemifts, Mr. scheele, and my friend Mr. 
BERGMAN, prbfeffor of chemiftry at Upfal, have lately difco- 
vered that human calculi of the bladder, though of an animal 
origin, are nothing elfie but a peculiar concrete acid, approach- 
ing in its qualities very nearly to the native vegetable acid : and 
Profeffor creel has lately Ihewn, in a paper prefented to the 
Royal Society, that the prefence of an acid, far from proving 
any thing againft an animal fubftance, is to be found in the at 
* Chemiftry (hews that in all animal excrements an acid is prefent, though dif- 
ferent from that found in ambergrife. Beftdes, we do not know whether the ma- 
rine acid of the fea-water in which thefe animals conftantly live, as not a lar 
in changing the nature of their fasces; nor whether the faces of all cetaceou 
animals are perhaps by their chemical analyfis not materially different rom « o 
of animals living on the Continent. We have a chemical analyfis of thefe 1. , 
Imt none has. been hitherto made of the former. 
