62 WATER-LILIES 



about two feet square or even larger. After 

 boxing, the plant is returned to the pond, 

 where it will continue to grow until fall, at 

 which time it can be transported bodily to a 

 tank in the greenhouse. By keeping the water 

 in the tank at ordinary greenhouse tempera- 

 ture, that is to say, 60° to 65° F., growth will 

 not be interrupted, though somewhat 

 retarded, and the tubers have an opportunity 

 to mature. Following this method, it is 

 highly probable that in the spring we will not 

 only have the parent plant but likewise a 

 number of small tubers, which will bloom 

 the same season. 



The temperature of the water in these 

 growing tanks should be about the same as 

 that of the house in which they are placed, 

 that is to say, about 65° F. A little more 

 heat is desirable for ISf ymphcea Sturtevantii, 

 and a greenhouse pipe may be passed through 

 the tank to supply the requirement. In an 

 emergency, heating the tank with a coal-oil 

 stove placed under it may be resorted to, but 

 cannot be recommended as a general rule. 



