1060 SOLID PARTS OF ANIMALS. 



The constituents of the brain of man, enumerated by Fremy, 

 are : 1. Cerebric acid free or combined with soda, or with phos- 

 phate of lime. 2. Oleophosphoric acid free and combined with 

 soda. 3. Oleine and margarine. 4. Minute quantities of oleic 

 and margaric acids. 5. Cholesterin. 6. Water and an albu- 

 minous matter. These results are quite different from those 

 previously obtained by M. Couerbe, whose method of investiga- 

 tion appears to have been defective. 



Fremy found a considerable quantity of cerebral matter in 

 the spinal marrow, and very appreciable quantities of it in cer- 

 tain nerves. 



The eye. The scelerotica is dissolved, like the corium, by 

 long boiling with water 9 and gives a solution of gelatin; it is said 

 to contain no fibrin. The cornea is composed of cartilaginous 

 fibres, and therefore consists of chondrin; but it contains be- 

 sides, a small quantity of fibrin or albumen. The pigmentum 

 nigrum (page 1043) has considerable resemblance to hematosin. 

 The vitreous and aqueous humours consist of water with about 

 1 per cent of common salt, a little albumen and undetermined 

 animal matter. The substance of the crystalline lens agrees in 

 properties with the globulin of the blood, and may be represent- 

 ed as a compound of 15 atoms of protein with 1 atom of sulphur. 

 When rubbed in pure water, the greater part of the crystalline 

 dissolves ; the solution is coagulated by heat, and forms a gran- 

 ular and not a coherent mass. The crystalline undergoes the 

 same coagulation when put into hot water, into alcohol, or into 

 an acid. 



