tificial cold on the forcing of plants", describes experiments made 

 in 1907 on Syringa, Prunus triloba t Deutzia Limoinei and D. gra- 

 cilis; Magnolia and Convallaria. Large numbers of these, as well 

 as other plants, were placed in a refrigerating chamber on October 31 

 and maintained for a week at a temperature of from 3 4 above 

 freezing point. 



In this case the drying effect of the low temperature became 

 evident, for the plants gave off so much water vapour as to form 

 a coating of snow on the pipes in the refrigerating chamber, where, 

 evidently, the temperature was lower by several degrees than in 

 the middle of the room. 



The advocates of the yet more recent hot water method 

 claim that it is much easier of application and more certain in 

 results than the ether method, which requires an air-tight chamber. 

 Among the plants which have responded to this treatment are 

 Lilaea Forsythia suspensa, and many other species of less horti- 

 cultural importance. The plants to be treated are plunged in tepid 

 water at a temperature ranging from 85 to 96 F. (30 to 35 C.). 

 The roots are not submerged, but the rest of the plant is kept 

 under the water for periods varying from 6 to 12 hours. 



