50 
% 
that no two plants w r ere in contact. One hundred were left untreated; 
100 were sprayed every other day with the ammoniacal copper carbon¬ 
ate solution, and 100 with Bordeaux mixture, 4 pounds of lime to G of 
copper. Only the upper sides of the leaves were sprayed at first, but 
later the spray was applied to both sides. The results of the experi. 
ment w T ere only moderately satisfactory, due in some measure at least to 
this early exposure of the under sides of the leaves, but in June the 
plants were visited and the effects of the Bordeaux mixture could be seen 
for some distance, the lot thus treated being much more vigorous than 
the other two. The effects of the copper carbonate were not very appar- 
rent. There were diseased plants among those treated with Bordeaux 
mixture, but the foreman of the greenhouses was so encouraged by 
the results that he had decided to spray the plants out of doors as well. 
An experiment made at the Department by Mr. Galloway, on a smaller 
scale, was less successful. Plants which were dipped in the mixture 
developed the disease, but there is sufficient encouragement for florists 
to try the mixture thoroughly another year, taking especial care to spray 
both sides of the leaves. It is of prime importance to completely clear 
the greenhouses of all diseased plants and raise an entirely fresh stock. 
The spraying should begin as soon as the first leaves come out, and be 
repeated every other day. 
For applying the solutions on a small scale, any force-pump will 
answer, providing it is supplied with a suitable nozzle, such as the Ver- 
morel or Japy. These can now be obtained from nearly all the large 
firms who deal in florists’ supplies. Where the cultivation of the holly¬ 
hock is made an extensive business, the knapsack form of sprayer, such 
as described on page 51 of the present number, will be found very serv¬ 
iceable for applying the remedies. 
EXPLANATION OF PLATE. 
Plate III .—Colletotrichium althcece, n. s. 
Fig. 1. Section through fruiting pustule X 500. 
2. Basidia bearing spores at their apices. The branched basidium was drawn 
from a specimen kept in a moist place X 600. 
3. Small fruiting body grown on artificial substratum. It will be seen that the 
set® are longer than in fig. 1, which represents the fungus on the plant, X 
500. 
4. Germinating spores, X 600. 
5. Section through young fruiting pustule made befoie the epidermis had been 
ruptured X 600. 
6. Set® and spores X 600. 
7. Mycelium in the tissue of a leaf as seen through the epidermis X 600. 
X 
