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As the spring advances, it will be found 

 necessary, and convenient to admit a more free 

 circulation of fresh air, and on account of the 

 encreasing drought and heat of the season, 

 water must be given more plentifully ; but the 

 houses must not yet be left open at night, par- 

 ticularly the top lights, as the weather is in 

 general so very changeable at this season, that 

 it frequently happens, although the evening 

 may appear mild and serene, the morning 

 ushers in with a severe frost ; which if admitted 

 to the plants, would materially injure them ; 

 and perhaps at once render all the winter's care 

 and attention abortive. Therefore, 1 would not 

 recommend any dependance on the weather, 

 (at night in particular) until about the middle 

 or end of May, as it seldom becomes in any 

 degree settled before that period, when, being 

 arrived at the season, in which all nature springs 

 afresh, and puts on her robes of green, and 

 naturally secured against the return of frosts, 

 we may venture to expose the plants both 

 day and night to all the vicissitudes of the 

 weather, should it continue in any degree 

 moderate. 



Being thus treated, they will require a con- 



