128 Journal of Comparative Neurology. 



that have been treated with alcohol ; but they seem to possess 

 a greater amount of toughness and elasticity. 



Note. — The following points are added at the suggestion of Prof. Wilder : 

 I. The pia may be removed more conveniently before the brain is put into 95 

 per cent, alcohol. 2. When first placed in the 95 per cent, alcohol a hemicere- 

 brum or half-brain should rest upon its mesal and approximately flat surface for 

 at least two days; otherwise some lateral flexure will occur. 



When the percentage of formalin is mentioned in this article it refers 

 to the per cent, of formic aldehyde present. 



