NEKVE. 157 



mixture of cerebric acid, several lecithines, cholesterine, 

 and fats. It is interesting as a microscopic object 

 from its developing peculiar stringy growths when 

 placed in water. 



Myosine. From the muscles of an animal just 

 killed; the plasma or liquid portion is removed by 

 pressure, beaten with a rod while it coagulates, and 

 the coagulated flakes of myosine washed with water. 

 In properties myosine closely resembles fibrine, but is 

 flaky, not fibrous, more transparent in appearance, 

 easily soluble in a 10% solution of sodium chloride, and 

 precipitated on dropping this solution into water. 



Nerve. 1. Nerve is similar to brain in constitution. 

 The brain fats which have been found in nearly all 

 parts of the organism are probably due to the presence 

 of minute ramifications of nerves. 



2. Examine under microscope. Nerves consist 

 of either fibres or cells. The fibres are generally made 

 up of an outer sheath, a "medullary substance," con- 

 taining albuminous matter and fats, and a central 

 " axis cylinder" of albuminous matter alone. The 

 medullary substance, and perhaps the axis, coagulate 

 after death. The nerve- cell or vesicle has a nucleus 

 and nucleolus, and differs in composition from the 

 nerve-fibre, being soluble in acetic acid. 



3. The substance forming the " axis cylinder" 

 resembles fibrine and myosine, but differs from the 

 former by being insoluble in potassium nitrate, from 

 the latter by not dissolving in dilute acids. 



