TEMPERATURES 5s 
The spread of this disease is favoured by damp condi- 
tions. On its appearance, the affected part should be 
cut away with a sharp knife and burnt. It is most 
prevalent in autumn and early winter. The structures 
should be kept as dry as is possible, consistent with the 
maintenance of the plants in good health, using as little 
water as possible, and admitting air freely except during 
driving rains. A slight heat should be kept in the water- 
pipes to prevent condensation, and, with judicious care, the 
plants should soon grow out of this disease if they are 
not too badly affected. Should the attack be very severe, 
the best thing to do is to burn the plants and obtain a 
clean stock, as the efforts to stamp out the disease will 
cost more than the purchase of fresh plants. The chief 
point to remember is that well-grown, vigorous plants 
are better capable of resisting the attacks of all pests 
than plants which exhibit a weakly condition through 
mismanagement. 
Temperatures.—If high temperatures are allowed, the 
plants soon show ill effects in the weakened state of the 
growth and foliage. In the winter months, assuming the 
weather is mild, a night temperature of 45° is suitable, 
and it may rise during the day by solar heat to 50°; but 
in spells of severe weather 5° less all round is necessary 
to the health of the plants. When growth is apparent 
in the spring, the temperature may be raised slightly ; but 
later, in early summer, considerable difficulty will be found 
in keeping the temperature as low as is desirable. 
Shading.—At no time during the season must the plants 
be placed out-of-doors, notwithstanding that this practice is 
sometimes advocated. The chief reason for keeping them 
