78 
with circumstantial evidence and reached full fruition in the dis- 
covery. 
Of course, the strong, practical bearing of this literal unearthing 
of truth goes without further saying. The fact that these common 
Fic: 3. 
weeds are the secret hot-beds of this miserable pest is enough t? 
cause the truck growers to raise the hand of destruction against 
them. It is likely that the number of species of cruciferous weeds 
bearing the Plasmodiophora can be increased as the search is COM” 
tinued. Byron D. HaLsTED. — 
Rutcers COLLEGE, January 12, 1894. 
