CERTAIN BRITISH HETERCECISMAL UREDINES. 
151 
On the Life-History of certain British Heterce- 
cismal Uredines. (The Ranunculi iEcidia 
and Puccinia Schceleriana.) 
By 
Charles B. Plowright. 
In the following communication, the life-histories of five 
species of Uredines which during the past three years have 
been investigated are detailed, together with an enumeration of 
the experimental cultures performed in connexion therewith, 
by which it will be seen that the conclusions have not been 
hurriedly arrived at. It may be thought that many of these 
cultures are needless repetitions, but I have found myself com- 
pelled to differ in certain points with the eminent Continental 
botanists who have made this subject their special study, and 
to whom, indeed, we owe all the information we at present 
have concerning it. It will be seen that these differences are 
mainly connected with the host plants upon which the various 
Uredines in question occur. It is hoped that my eminent 
confreres will recognise the fact that my investigations have 
not been made in any spirit of captious criticism, but rather 
with the object of verifying and amplifying the discoveries 
they have already made. Hence when any statement of theirs 
has been found to accord with my own results, this particular 
culture has not been repeated many times. For example, 
with Uromyces dactylidis twenty-seven experiments were 
made altogether, but of these only five were confirmatory of 
Schroter’s statement as to its iEcidium occurring upon Ranun- 
culus bulbosus, for the simple reason that Schroter’s 
statement on this point is correct, and it would have been a 
