NOTES ON SPOEOZOA. 
235 
no doubt that it is a question of a double infection of the 
host-cell, i.e. by two small individuals which may be of the 
same or of opposite sex, which grow up in contact with each 
other. And I am practically cei tain that the same explanation 
holds good also in the present case of Leucocy tozoon. 
In conclusion, I am sorry to say that, in my opinion, 
Prowazek does not bring forward a particle of reliable 
evidence which is of any use towards rehabilitating Schau- 
dinn’s unfortunate view. 
The Lister Institute ; 
April, 1912. 
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