38 ON THE RELATIONSHIP OF ^CIDIUM BERBERIDIS, PER6., 
plants selected for check plants which were never covered. The 
sEcidium spores germinated freely upon a glass slide. On the 
17th day Uredo appeared on the five oldest of the infected plants. 
On the 24th day the experiment was concluded. There were then 
five infected plants with Uredo upon them, the two youngest having 
escaped and seven check plants with Uredo upon them. 
Experiment VII. — On the 29th July five wheat plants were 
inoculated with sEcidiwni spores from Flitcham (distanced 8 miles), 
and a similar number of check plants selected. On the 12th day 
Uredo was observed on the five infected plants, and upon two, 
possibly upon three of the checks. 
Experiment VIII. — On the 29th July four wheat plants were 
infected with Aicidium from Flitcham, and a like number of check 
plants selected. On the 9th day all the infected plants had Uredo 
on them, as had three of the check plants. 
Experiment IX. — On the 1st August four plants were infected 
with AZcidium from Narborough, and four plants selected as checks. 
On the 22nd day three of the infected plants and three of the 
check plants had Uredo upon them. 
I now determined upon asking my friends to grow the check 
plants for me, as I came to the conclusion that my garden was 
saturated with the spores of Uredo linearis. 
Experiment X. — On the 19th July some foreign wheat was 
planted, and a portion of the same seed wheat sent to Mr. Phillips, 
at Shrewsbury, with the request that he would plant it in his 
garden, and in due time select six check plants to be kept against 
six which I would inoculate in Kings Lynn. This Mr. Phillips 
kindly consented to do, and upon the 1st August I duly inoculated 
my six plants with spores of jEcidium berberidis from Narborough. 
I kept my plants almost continuously covered until the end of the 
experiment. On the 7th day Uredo appeared upon two of my in- 
fected plants, on the 8th day upon three more. As soon as I ob- 
served my plants had developed the Uredo I pulled up each affected 
plant so that it might not infect the others. On the 15th day Mr. 
Phillips wrote me word that all his six plants were attacked by 
Uredo. I had still one of my infected plants which remained 
healthy ; this, however, on the 19th day developed the Uredo and 
the experiment was terminated. 
Experiment XI. — A sample of wheat was divided between my 
friend, the Rev. J. M. Du Port, of Mattishall, near East Durham, 
and myself, and the experiment conducted in the same manner as 
the preceding, excepting that Mr. Du Port sowed his wheat in 
two patches, Nos. 1 and 2, in two different parts of his garden. 
Patch No. 2 being sown three days later than No. 1, there being 
eight plants in each patch. On the 8th August I infected eight 
plants with jEcidium from Narborough, which were covered by a 
bell glass for 12 days. It was then removed for 48 hours and re- 
placed on the 14th day. On the 15th day three of my infected 
plants had Uredo upon them, on the 25th day one more, on the 28th 
