Animal Substances. 289 



respect similar to the sugar of vegetable?, and 

 particularly in milk. 



7. Oils, as to their general properties, have 

 been treated of in the lecture on Combustibles. 

 The animal oils are spermaceti, fat or tallow, 

 train or fish oil, and butter. The first of these, 

 spermaceti, is distinguished from all other oily 

 bodies by the crystalline appearance it assumes. 

 It is found in the skull of the spermaceti whale, 

 and forms also a copious sediment in the oil of 

 that animal. 



8. Resins have also been already noticed. A 

 resin is found in the bile of animals. Amber- 

 gris too is considered as an animal resin, being 

 formed, as is supposed, in the stomach of the 

 spermaceti whale. Castor, civet, and musk are 

 also referred to this class. 



9 and 10. Sulphur and Phosphorus are also 

 found in animals. The latter exhales copiously 

 in putrefaction in the state of phosphuretted hy- 

 drogen gas, and often produces those luminous 

 appearances in putrid fish, &c. so terrifying to 

 old women and children. 



11. The acids which have been detected in 

 animal bodies are the phosphoric, sulphuric, 

 muriatic, carbonic, benzoic, uric, rosacic, am- 

 niotic, oxalic, acetic, malic, and lactic. 



12. All the alkalies have been found in the 

 fluids of animals. 



1 3. The only earths that exist in animal bodies 

 are lime, magnesia, and silica. 



VOL. II. O 



