14S 



THE AMERICAN NATURALIST [You LIV 



Usually appears 

 Diminishes at ri 

 Affects mostly i 

 Progressive in i 



Infection indicated. 

 (Wilson, 1912; Spiller,* 1916.) 



(Merzbacher, 1908; Batten and 



Congenital or in first three months. Affects chiefly males. 

 Hereditary. Slowly if at all progressive. 



Not so fatal. 

 Paramyotonia congenita. (Eulenberg, 1886.) 



Congenital. Tonic spasms. 



Hereditary. Not always bilateral. 



Last for hours. 



Apparently dominant. 



It is clear that none of the above-mentioned conditions 

 can be considered as identical with congenital palsy. The 

 most common similarity is that several of them are known 

 to be recessive in inheritance, but they all differ in other 

 symptoms. Congenital palsy differs from any of the 

 other conditions in being definitely congenital and run- 

 ning a brief course terminating in death at an early age. 



In conclusion it may be pointed out that while the data 

 may never be sufficiently complete in man, it may be pos- 



* According to Spiller the conditions attributed to disease of the lenticular 

 sm- ,„ j i. Huntington's chorea, Parkinson's disease, and a number of others. 



