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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 por- 
tion of the same wheat seed 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 Mcidium 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 infected plants; on the 8th day upon three more. As 
soon as I observed 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 in- 
fected plants which remained healthy ; this, however, on the 19th day developed 
the Uredo and the experiment was terminated. 
ExprriIMentT XJ.—A sample of wheat was divided between my friend, the 
Rev. J. M. Du Port, of Mattishall, near East Durham, and myself, and the ex- 
periment 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 eci- 
dium from Narborough, which were covered by a bell glass for 12 days. It was 
then removed for 48 hours and replaced 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 day two more, on the 31st day onemore. At this time the experiment ended, 
and Mr. Du Port reported that patch No.1 had three plants in it with Uredo 
upon them, but that patch No. 2 had not a single sound plant in it. 
EXPERIMENT XII.—Fifteen wheat plants grown in my garden from one of 
the best samples of last year’s wheat that had been offered in the Lynn Market, were 
on the 11th August infected with cidiwm from Narborough. I purposely kept 
this cidiwm 62 hours in a damp atmosphere in my study, and used the water 
upon which the spores had abundantly fallen, as well as the spores themselves, for 
infecting the wheat plants. On the 17th day three plants developed Uredo, on 
the 20th day six more, on the 22nd day one more, on the 23rd day two more, mak- 
ing a total of 12 infected plants out of 15, which developed the Uredo in the course 
of 23 days. Of the 15 check plants seven only were diseased. 
ExpertMent XIII.—The thirteenth and final experiment was conducted upon 
a totally different principle. The wheat seed was poisoned by steeping it in a 
solution of cupric sulphate : and the ground in which it was planted was watered 
with a solution of carbolic acid in water. Two bell glasses thoroughly disinfected 
with carbolic acid and the copper solution were placed over both the patch to be 
used as check plants, and over the pots containing plants to be affected. These bell 
