90 INTRODUCTION. 



ciples in this group which are well established, and have been 

 studied to a greater or less extent : 



Globuline, 



Crystalline, 



Musculine, 



Osteine, 



Cartilagine, 



Elasticine, 



Keratine. 



Globuline. This is a semi-solid organic principle, con- 

 stituting the greater portion of the blood corpuscles. It is 

 soluble in water, from which it is coagulated by a tempera- 

 ture a little below the boiling point. Excepting that when 

 mixed with water it requires a much higher temperature 

 for its coagulation, it has nearly the same properties as 

 albumen. 



Like the rest of these principles, it exists in a state of 

 intimate molecular union with inorganic elements; but, 

 exceptionally in this case, is united with a small quantity of 

 fat. In this condition it goes to form the organized structure 

 of the blood corpuscles. 



Crystalline. This is a semi-solid organic principle, 

 peculiar to the crystalline lens. It presents most of the 

 characters of globuline, but is coagulated at a little lower 

 temperature, though higher than is required to coagulate 

 albumen. 



Musculine. This semi-solid organic principle is peculiar 

 to the muscular tissue. It is immediately dissolved at the 

 ordinary temperature by a mixture of ten parts of water with 

 one of hydrochloric acid. It may be precipitated from this 

 solution by neutralizing the acid, and the precipitate is re- 

 dissolved by an alkali. It is always united with a consider- 



