1916] 
GILMAN—CABBAGE YELLOWS 35 
No attempt was made to find the maximum and minimum 
growth temperature for this fungus, because the object of 
the work was to find, if possible, an explanation for the fact 
that yellows occurred in the host at high temperatures rather 
than at low. This relation will be discussed later when a full 
review of the points involved will be taken up. 
INOCULATION EXPERIMENTS 
The first inoculation experiments were tried during the sum- 
mer of 1912. On July 17 five flats of soil were planted to 
cabbage; three contained soil brought from the experimental 
plot at Racine and two, normal greenhouse soil. One of the 
latter was left as a control, and the other was inoculated with 
spores from a pure culture of the fungus. These flats were 
kept shaded on the north side of some shrubbery in the path- 
ological garden and no typical yellows had appeared by Sep- 
tember 7, when they were discarded. On August 23 five plants 
in the pathological garden were inoculated by placing myce- 
lium of a rapidly growing culture in contact with the roots. 
No disease was found up to October 22, when frost killed the 
plants. The seedlings were two weeks old at the time of inoc- 
ulation. Again, on September 10, thirty healthy plants were 
transferred to three flats of soil brought from the experi- 
mental plots at Racine, but no disease was found in any of 
the flats by December 2. 
On January 6, 1913, twelve pots of sterile soil were planted 
to cabbage and inoculated by stirring cultures of Fusarium 
into the pots. Twelve pots of diseased soil from the experi- 
mental plot, eight of sterilized soil, and four of normal undis- 
eased soil were planted as controls. Spores were abundant 
in all the cultures used. No yellows had appeared by April 
29, and the plants were then pulled and the pots replanted. 
Instead of keeping this second lot in the open greenhouse, 
