SULPHUR FOR MILDEWS. gI 
perfectly dormant, such treatment is not followed by any 
evil effects. 
During the past spring several growing plants were 
exposed to the action of the gas when used according to 
the above directions. Tomatoes, eggplants, oranges, and 
roses were used. The day following the treatment showed 
that all the plants were injured, but to what extent could 
not be well determined. After two weeks had passed, 
however, the effect of the treatment was plainly seen. The 
tomato plant died; the eggplant and the rose lost all 
their foliage, but fresh leaves were appearing on the 
stems; the orange suffered the least, since only the 
young leaves were affected. The mites had all been 
killed, so that in this respect at least the experiment was 
successful. 
Other trials were made with the gas, using the same 
kinds of plants, but it was found to be impossible to de- 
stroy the mites without injuring at least some of the 
plants. The use of hydrocyanic gas for the destruction of 
greenhouse pests can therefore scarcely be recommended. 
It should also be remembered that this gas is exceed- 
ingly poisonous, and must not be inhaled. 
Sulphur.—This element is of the greatest service in 
greenhouse work. It is an invaluable agent for the de- 
struction of mildews, and is also of great assistance in 
overcoming red spider. As commonly used, it is mixed 
with an equal bulk of air-slaked lime or some similar 
material, and then water, oil, milk or some other liquid 
is added until a thick, creamy paste is obtained. This is 
then painted upon the heating surfaces in the house, and 
the sulphur fumes are given off. The same result can be 
obtained much more rapidly and energetically by heating 
the flowers of sulphur until it melts; the fumes are then 
given off in great abundance. Our practice has been to 
put the sulphur in a shallow pan and then set it over an 
oil-stove, having the flame turned just high enough to 
keep the sulphur in a melted condition. Almost contin- 
