PLUMS AND DAMSONS TEMPERATURE AND VENTILATION. 195 



cially, 50 in mild weather, ventilating and closing at that temperature. In a fortnight 

 increase the day temperature a few degrees, with a little air, 55, closing at 50, and 

 maintain 40 at night by artificial means. Continue this treatment, bringing the trees 

 into flower gradually, with a night temperature of 40 to 45 U , increasing 5 by day, 



Fig. 50 CZAK PLCM TKF.E IN A POT. (From the Journal of Hortirult ure, March 16th, 1893, page 215.) 



admitting air at 50, more at 5">, not allowing 65 to be reached without full ventilation, 

 closing at 55. "When the flowers are expanded, allow 5 more all round in mild 

 weather; otherwise adhere to the temperatures named. This is sufficient and safe till the 

 plums have set and commence their first swelling, when the temperature may be raised to 



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