fletereecism, 55 
for although the above facts were in themselves unanswered, 
yet the so-called scientific botanists urged that the fungus 
upon the barberry leaves belonged to a totally distinct 
genus (AEcidium) to that upon the wheat (Puccinia). There 
is evidence to show that many careful observers, even at 
this time, suspected that the Puccinia was connected in 
some way with the uredospores which occur as its pre- 
cursors, This remained a suspicion only until Tulasne_ 
demonstrated that the connection between the uredospore 
and the teleutospore existed not only in the species in. 
question, but was the general rule amongst the Uredinez. 
In 1861, De Bary showed that many of the Uredinee not 
only had uredospores and teleutospores, but also that the 
latter gave rise in many cases (but not in all) to zcidio- 
spores, and conversely the zcidiospores to uredospores. 
De Bary also pointed out that in certain cases the 
sowing of germinating teleutospores upon the same species 
of host-plant which bore them was not followed by any 
result. Amongst these were Puccinia graminis. It further 
occurred to him that, as there were several zcidia unac- 
companied on their host-plants by any other spore-form, 
these might belong to Uredines which passed a part of 
their life upon one plant and the remainder upon another. 
Familiar with the facts already known to the practical 
agriculturist concerning the barberry and wheat mildew, 
he put the matter to the test of actual experiment. In 
1864, he sowed Puccinia graminis on barberry and produced 
the Aicidium, and in 1865 he did the converse culture, by 
sowing the zcidiospores upon rye. 
The results obtained by his experiments with P. 
gvaminis led De Bary to investigate the life-histories of 
other zcidia, which, like 4c. berberidis, are unaccompanied 
by any other spore-form on the same host-plant. Thus he 
found that P. rubigo-vera has its ecidiospores upon Lycopsis 
