Part III.-BULBS UNDER GLASS. 



CHAPTEB I. 



HOTHOUSE. 



IN this chapter we include those bulbs and tubers which 

 require a fairly warm temperature all the year round to 

 grow them to perfection. The structure in which they 

 should be grown is commonly known as a hothouse, or 

 stove, with a day temperature of 65 to 70 deg. in winter, 

 70 to 75 deg. in spring, 75 to 80 deg. in summer, and 70 

 to 75 deg. in autumn; also a night temperature of 60 to 

 65 deg. in winter, 65 to 70 deg. in spring, 70 to 75 deg. in 

 summer, and 65 to 75 deg. in autumn. While the fore- 

 going are the average temperatures for such a structure, 

 it is not always essential that they should be adhered to 

 strictly, since some plants may do well in a slightly lower 

 temperature, and where such is the case the fact will be 

 duly mentioned in connection with each genus of plants. 

 It is essential, moreover, to start some bulbs and tubers 

 in the hothouse, removing them to a cooler temperature 

 later on, and this fact also will be duly noted as we proceed. 

 So much by way of preface, and now we will deal with 

 each genus separately. 



Achimenes. These are South American tuberous- 

 rooted plants, flowering chiefly in summer, growing one 



