282 Chemistry. [Lecture 34. 



resemblance to animal glue. It contains oxy- 

 gen, hydrogen, carbon, and nitrogen. 



14. Fibrina is, as well as albumen, an animal 

 matter, constituting the fibrous part of the mus- 

 cles of animals. A substance resembling it has 

 been detected in the juice of the papaw. 



15. Of the vegetable oils we have already 

 treated in the lecture on Combustibles. 



1 6. Wat) though that which is used in com- 

 merce is collected by the bees, is in reality a ve- 

 getable substance, and it appears not to undergo 

 any change whatever in its nature or character 

 from the industry of those extraordinary ani- 

 mals, who merely extract it from the leaves of 

 trees and other parts of vegetables. Like the 

 oils, to which it bears a near relation, wax con- 

 sists entirely of hydrogen and carbon. One hun- 

 dred parts of wax contain 



82-28 of carbon. 

 17*72 hydrogen. 



100- 



The myrtle wax, which is contained in the 

 berries of the myrica cerifera of America, in its 

 nature and general properties seems perfectly to 

 agree with bees-wax. 



17. Of resins I have partly treated in the lec- 

 ture on Combustibles. It is well known that 

 they exude from trees, particularly the firs. It 

 is probable that resin is volatile oil, deprived of 



