EXPERIMENTS UPON THE HETERCECISM OF THE UREDINES. 55 
the process was completed on the following day (the 15th), and on 
the 17th. The bellglass was not removed until the 24th. On 6th 
May spermogonia appeared, and on the 24th the perfect sEcidium 
was noted on 20 leaves. A precisely similar barberry kept as a 
control plant had no sEcidium upon, although grown in the same 
garden, and carefully observed throughout the summer. 
Exp. 14. — A similar barberry plant was on the 17th April in- 
fected with the same material. On the 6th May spermogonia and 
on 3rd June perfect sEcidia were noted, the control barberry 
remaining free from the fungus. 
Exp. 19. — On 9th May a similar barberry was infected. On 
25th spermogonia and on 15th June perfect ^ Ecidia were noted. 
The control barberry remained free from the fungus. 
AZcidium berberidis and Puccinia graminis. 
Exp. 48. — 24 wheat seedlings growing in a flower pot, which 
had been continually covered by a bellglass from the day the wheat 
was sown, were on 23rd May infected with ripe spores of sEcidium 
berberidis , sent for the purpose by Mrs. Howell, of Drayton Rectory. 
On the 3rd June sickly yellow spots appeared on some of the plants ; 
on the following day (4th June) true Ureco linearis made its appear- 
ance. On 8th June the pot was removed from the garden into a 
room in the house, and the diseased plants removed. By the 30th 
every plant had the parasite on it. A similar pot of wheat seed- 
lings grown under exactly similar conditions, but not infected with 
sEcidium spores, remained free from Uredo. 
Exp. 80. — Five wheat plants which had been reared under a 
bellglass were on the 28th June infected with sEcidium berberidis 
spores from Exp. 14; on 17th June Uredo appeared on one leaf, 
and three days later on the others. The five control wheat plants 
remained healthy. 
Exp. 81. — Many wheat seedlings reared under a bellglass were 
on 28th June infected with sEcidium berberidis spores; on 16th 
August Uredo was noted on them. A similar pot of wheat seed- 
lings not infected with the iEcidia spores remained healthy. 
Puccinia caricis and Mcidium urticae. 
Exp. 2. — On the 8th April three plants of Urtica dioica were 
planted in a flower pot ; around them was laid a quantity of Carex 
hirta , with last year’s Puccinia caricis on it. The pot was covered 
by a bellglass, and freely watered. On 2nd May two of the plants 
were heavily affected with sEcidium urticae ; on 6th May the nettles 
were planted out, and the Carex straw removed and destroyed. 
On 9th May all three plants were much distorted, both on their 
stems and on their leaves, with the sEcidium, 
sEcidium urticae and Uredo caricis. 
Exp. 33. — On May 15th a clump of healthy Carex hirta grown 
in a flower pot under a bellglass for three weeks, had two leaves of 
nettle with sEcidium on them from the previous experiment (Exp. 
