146 Salmon. — Further Cultural Experiments with 
marked place, on the wheat leaf. The powdery mass of accumulated 
conidia was removed from the wheat leaf. On the twelfth day the Fungus 
bore, at the same spot, on the wheat leaf another powdery crop of conidia. 
No trace of any infection occurred on the barley. 
Experiment No. #033. Conidia produced on the twelfth day were 
sown, at a marked place, on a leaf of barley and of wheat. As in the above 
experiment, successive crops of powdery masses of conidia were produced, 
at the marked place, on the wheat on the ninth and thirteenth day. No 
trace of any infection appeared on the barley. 
Experiment No. a 043, Conidia produced on the fourteenth day 
were sown, at a marked place, on a leaf of barley and of wheat. Each leaf 
was made slightly damp with distilled water over the area of the marked 
place. Barley leaves bearing some hundreds of conidiophores in little 
scattered groups were then laid for a second over the marked place, so that 
hundreds of conidia were deposited on each leaf. By the eleventh day 
numerous powdery Oidium- patches occurred on the wheat leaf at the 
place of inoculation ; no trace of any infection appeared on the barley leaf. 
(b) Conidia produced on barley leaves previously immersed 
for 5 hours in io°/ o alcohol. 
Experiment No. <2047. Conidia produced on the ninth day were 
sown, at a marked place, on a barley and a wheat leaf. By the sixth day 
two little powdery Oidium patches were produced on the wheat leaf, at 
the marked place ; no trace of infection resulted on the barley. 
Experiment No. <2054. Conidia produced on the tenth day were 
sown on two barley leaves and three wheat leaves. The barley and wheat 
leaves were damped on their upper surface, and then this surface was laid 
for a second on a barley leaf bearing a large number of scattered tufts of 
conidiophores. By the seventh day all the wheat leaves were fully infected ; 
one leaf bore over twenty small, vigorous, powdery patches of Oidium , the 
second leaf bore nine patches, and the third leaf three patches. By the 
tenth day two of the wheat leaves bore almost continuous densely powdery 
Oidium-psLtch.es extending for a distance of 2-5 cm. No trace of any 
infection appeared on the two barley leaves. 
(c) Conidia produced on barley leaves previously immersed 
for 19 hours in io°/ o alcohol. 
Experiment No. a 088. Conidia produced on the eleventh day were 
sown, at a marked place, on a leaf of barley and of wheat. By the seventh 
day several little powdery Oiduim- patches were visible, at the marked 
place, on the wheat ; no trace of any infection appeared on the barley. 
