166 THE GRAPE. 
there is no reason why it should be invariably accepted to 
the entire exclusion of any other. However, where the 
disposition leads that way, and all the above-mentioned 
considerations are not to be acquired, it will answer the 
rpose, and if the slope be anything like steep, the whole 
extent will have to be formed into terraces. This becomes 
more or less expensive according to the angle of ascent. 
It should also be remembered, that on a hill-side, the cold 
air, more particularly in the night, is constantly moving 
along the surface, from the top towards the bottom, there- 
by preventing that health-producing evaporation of warmt 
m the soil which is obtained from the solar heat of the 
previous day, and causing, in our extreme climate, a con- 
densation of the moisture as it radiates upwards, which is 
then carried along towards the lowest level in the form 
of a damp and cold draft among the under parts of the 
plants; and it does not require a second thought to under- 
stand how injurious such a circumstance is in all other 
kinds of culture. No doubt many will think that such 
notions as these are not worthy of consideration, but as 
we are being troubled with rot, mildew, and other hurtful 
affections, it is well to guard against all things that are 
likely to provoke, or produce the evil, and avoid them 
accordingly. Arguing from the culture of the grape- 
vine, or any other plant under glass, we know that such 
action would bring on these very diseases; and it is not to 
inside cultivation alone that we are at all times dependent 
for proof, for there now and then happens an example 
__ where a plant is trained on two aspects, or the head is in 
_ different positions, when one part is quite free from disease, 
while the other is badly affected ; and it is just possible 
_ that these cold currents of damp air is one of the causes 
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