ARTHUR: IMPORTANCE OF THE SPERMOGONIUM i273 
their specific value is considerable, first as an indication of the 
nature of the life-cycle, and secondly in furnishing positive char- 
acters for identification. Incidentally it has been explained that 
the common conception of the spermogonium as an accom- 
paniment of the aecidium, or other spore-forms, is incorrect and 
misleading. The spermogonium should rather be considered a 
fixed structure accompanied by some other spore-form as a rule, 
but in no wise dependent upon the same. 
PURDUE UNIVERSITY. 
