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frequent in the hot season, providing the above rule 

 were observed, viz., to first suffer the water in the axils 

 to evaporate. However, as the accumulation of solar 

 heat must be limited, and at least bear a proper ratio 

 to the intensity of light, moderation must be observed 

 in this as in other matters. 



4. GENERAL PRINCIPLES OF VENTILATION. 



We here find ourselves on somewhat disputable 

 ground, for practical men differ, perhaps, more on 

 this particular than any other. Some are for having 

 their houses, as it were, hermetically sealed ; others 

 talk about the wind blowing through them. 



The horticultural public, we are glad to see, are at 

 last becoming alive to the importance of settling this 

 branch of cultivation on a more permanent basis than 

 the mere opinion of any particular individual. For 

 ourselves, we are great advocates for a motion or cir- 

 culation in the atmosphere ; and we are happy to say 

 that we find Mr. Barnes, as well as several more first- 

 rate and truly practical gardeners, agreeing with us 

 on this point. 



To lay down anything like general rules is very 

 difiicult, especially in the present position of such 

 matters. We would merely observe that we ourselves 

 give air night and day at all times, were it in ever so 

 trifling a quantity, providing, we feel certain of se- 



