good policy to protect the plants from the unusual chilliness by covering them 
with paper blankets—ordinary news sheets will do quite well. This class will be 
referred to as B.2. 
The cool growing species will thrive in an ordinary bushhouse in Sydney north- 
wards, and will be referred to herein as B.3. 
(C). WATER REQUIREMENTS. 
As the temperature requirements for different species of orchids vary extensively, 
so do their water needs. In the class C.1. water must be literally poured on 
throughout the Summer season right up to the time when the season’s growths 
have reached full development; with the coming of Autumn the quantity of 
water should be appreciably diminished, but the plants of this group should not 
be allowed to dry out, and even in midwinter watering should be continued by 
giving the compost a good soaking once a fortnight—choosing a bright, clear 
morning for the purpose. 
Class C.2. Will require heavy watering until well into the Autumn, the plants 
then being allowed to dry out for the Winter, except for a soaking about once in 
four to six weeks, 
Class C.3. Will need heavy watering from the commencement of Summer until 
the first chill spell of Autumn, when watering should practically cease until the 
new shoots appear in Spring. 
In all the above classes it is desirable that the atmosphere in the house be kept 
moist throughout the growing period—i.e. from the time the first shoots of Spring 
show themselves until the last pseudobulb in Summer has grown to its maximum. 
As to Class C.4., however, although its plants like plenty of applied water in the 
Summer, they do best in a dry atmosphere. 
Class C.5. likes much less water in Summer than the other species, but likes it 
applied right up to the beginning of Winter—then water once in three weeks. 
This classification is intended to assist growers in the important factor of watering, 
but it is not intended as a hard and fast rule—the actual weather conditions pre- 
vailing at the time will necessitate an intelligent modification of the suggestions 
made. The ideal to be aimed at is to give the plants the necessary resting and 
maturing period without allowing the stems to wither or lose condition, Gener- 
ally speaking, the deciduous species can stand a much longer period of drought 
than can the evergreen or persistent leaved species. 
(D). REQUIREMENTS AS TO LIGHT. 
As a class the Dendrobiums are lovers of light and sun, but as in other things 
some species need more sun and light than others. I have classified them as 
follows:— 
D.1. Those that do best in full sunshine—right in the open in the case of the 
hardier species—close to the glass where glasshouse treatment is required, 
D.2. Those that like plenty of light, but cannot stand the full noonday rays of 
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