Smithsonian Report. 1947.— Abbott 



1. Exi)eriinental snails infected with deadly scliistusomes. The specimen bein^ 

 held is the West Indian carrier of Manson's. disease. (Photograph by Perry 

 National Institute of Health.) 



2. The venoniiiii- (diic -hrll- .if ihc I ii.l(.-i';icilic arc cnlUTtni - iimi-, ihii .ne 

 capal^le of iniiicting a fatal sting. Top row, left to right, the marble, geography, 

 and courtly cones; lower corners, the textile cone; lower center, the tulip cone. 



