30 THE GRAPE. 



conduct the applied heat away with a more than equal 

 ratio. Balancing all points, what is gained by one, is lost 

 in the other, and both are equally suitable. 



With regard to aspect, full south is the best, where con- 

 venience will allow. South, south-east, is sometimes re- 

 commended, but, although with care, it answers well 

 enough, there are the following objections. It often hap- 

 pens, that the most severe cold, or lowest grade of the 

 thermometer outside, is immediately before, or at the time 

 of sunrise, on the clearest mornings, and the heating ap- 

 paratus must not be allowed to cool down ; now as the sun 

 rises direct, or nearly perpendicular from the horizon, the 

 rays strike (with this aspect) very quickly upon the plane 

 of the roof, which in conjunction with the internal action, 

 suddenly raises the temperature, at the time when the ex- 

 treme cold, and often severe winds, will not admit of air 

 being given, consequently there is danger from the quick 

 transition unless the greatest caution be exercised. If the 

 house face full south, the sun at this time will strike more 

 obliquely on the end, which will to some extent counter- 

 act the evil, and there is also an advantage in having 

 greater natural warmth later on in the evening. 



The following cross section, and ground plan, figs. 4 and 5, 

 and description of an Early Grapery, now in care of and 

 erected under the supervision of the writer, and which has 

 answered every expectation, may be of service here, and 

 will illustrate our own practical ideas on the subject. The 

 dotted outline shows a house, which, in this example is 

 devoted to the growth of Camellias, and, being fixed in 

 this position does away with the necessity of a shed, and 

 assists in keeping the grapery from exposure. The same 

 arrangement will apply where there is a building already 

 erected, and which, would become the back wall of the 

 intended house. 



