PART I. 
CULTIVATION OF THE VINE. 
CHAPTER I, 
THE GRAPE HOUSE. 
THE situation and pitch of the roof, especially the 
pitch, have a deal to do with success in the cultivation 
of the vine. If the ground is flat, a sharper pitch in 
the angle for the roof is necessary than is required for 
a steep incline in the surface, on account of the dead- 
ness of the surrounding vapour on a flat above that 
of an incline. A flat roof, or at least a roof with an 
angle of less than 45°, is not good for grape growing. 
Generally roofs are much less than that ; but this angle 
and above that, are much the best for this purpose. 
Some persons will object to this sharp pitch for 
forcing purposes, on account of the more rapid ascen- 
sion of the heat to the higher part of the roof; but if 
sufficient heat is generated at the lower part so as to 
keep up a good temperature according to what is re- 
quired for the circulation, one that will keep the house 
healthy and produce fine coloured fruit will be ensured. 
