RAISING VARIETIES FROM SEED. 157 



ance and careful cultivation, this desirable end 

 may be obtained. To raise a double variety of 

 Rosa Hardii is. at any rate, worth attempting. A 

 flued wall must be used to train the plants to; and 

 in small gardens, where there is not such a con- 

 venience, a hollow wall might be built about four 

 or five feet in height and ten or twelve feet long, 

 of two courses of four-inch brickwork, with a space 

 between, into one end of which an Arnott's stove 

 might be introduced, and a pipe carried in a 

 straight line through to the opposite end (each end 

 must of course be built up to keep in the- hot air); 

 this pipe would heat the air between the two 

 courses of brickwork sufficiently for the purpose. 

 A fire should be kept every night from the middle 

 of May to the middle of July; and this treatment 

 would possibly induce some of these roses to give 

 their seed. Rosa Hardii would bloom freely if 

 trained to a hot wall ; and, if fertilised with the 

 Double Yellow Briar, seed may perhaps be ob- 

 tained. Maria Leonida, planted in an orchard 

 house, and fertilised with the Tuscany Rose, 

 might also give some curious hybrids. This is 

 all speculative ; but such speculations are, unlike 

 many others, exceedingly innocent and interest- 



