1904] SMITH—PUCCINIA ASPARAGI 37 
top shading and protecting the lower portion. Fig. 18 shows the 
bed still later, a condition which in beds well cultivated often lasts 
until November. The writer has considered that this feature may 
be due to the absence of rains to drive the spores more rapidly down 
Fic. 16.—Teleutosori on green branches at margin of spots as in figs. 14 and 15. 
through the tops, as he has never observed it in the east. By the 
means shown in fig. rg the rust can be absolutely prevented in Cali- 
fornia, although in Milpitas the covering must be thicker than on 
the islands, where one thickness of light cheese-cloth is sufficient. 
