pe 
amined, soon after infection, these plants like those in the 
previous series had been planted out in the garden. Each pot 
contained about six seedlings of each of the cereals. 
Uredo graminis Plant Infected. Date. Date of first 
from result. 
1310. Triticum repens ‘Triticum repens 18 July 3 August. 
1311. o Hordeum vulgare 18 July — 
L312. re Secale cereale 18 July — 
13i 3. es Avena sativa 18 July a 
1314, x Triticum vulgare 18 July —- 
1315. Poa trivialis 18 July — 
>D) 
[would appear then. that our English fungi “ate 
even more fastidious in their tastes than the Swedish 
for Eriksson finds that the form on Trzticum repens is also 
capable of affecting both rye and barley. Of course the negative 
result I obtained cannot be seriously compared with the hundreds 
of experiments which Eriksson and Henning have conducted. 
There is one error into which my continental friends have 
fallen about myself that I should like to take this opportunity 
of correcting. They consider that I have succeeded in producing 
the Uredo graminis on wheat from sowing the sporidia 
(promycelial spores) on wheat: this is a mistake I have never 
done so. It is true that in my first series of cultures made in 1883 
Uredo graminis appeared on some wheat plants to which the 
germinating teleutospores had been applied, but the plants had 
not been protected from external (atmospheric) infection and 
€ven grown in a small garden in which a great number of other 
wheat plants were growing all of which that year became 
Sooner or later attacked by the disease. In the following year 
I repeated the experiment taking care to keep the infected plants 
continously covered by a bell-glass and of course obtained 
negative results. 
One of the tangled problems in the hetercecious Pucciniz is 
eas by that group which forms its teleutospores on 
ee” Just as the barberry seems to be the 
sieeek es ae the acidiospores of a whole host of biological] 
arias a P. graminis is the type: so Phalaris 
specie see ne teleutospore-host for an extensive group of 
€ 1". sessits type, having their ecidiospores on many 
plants, viz. : gs 
a Nee : Allium ursinum, Convallaria majalis, Arum 
atum and Paris quadrifolia. 
aie for some years conducted a long series of 
esa a € view of determining the stability of these 
: eee € subjoined tabular summary, which he _ has 
view aad sent me, of the results he has obtained of our state 
owledge of the subject up to date is shown. 
