Violets. 191 



and as much glass as possible. Winter propagation will 

 also be facilitated by the use of twenty inches or more 

 of glass in the partition wall through the centre of the 

 house, and if permanent sunlight is not wanted through 

 this, it can easily be excluded by a light coat of white 

 paint, serving all the purpose of ground glass, For the 

 north roof, continuous ventilation formed by sash wide 

 enough to receive a twenty inch glass will be sufi&cient, 

 and this should be protected by a cap projecting from 

 the ridge to exclude gusts of air. The south one should 

 also be continuous, and both should open at the top. 

 In addition to this, if the part of the roof over the south 

 bench is made of movable sash, and the joints between 

 them capped by half-round battens, every other sash, or 

 as many as may be desired, can be so constructed as to 

 add to the ventilation on warm days by simply sliding 

 them down the distance wanted. To do this the upright 

 side of the gutter must be dispensed with. If it is de- 

 sired, the sash on the south roof can be removed in the 

 spring, the soil taken out, and the bench supplied with 

 new soil and young plants, which can be grown where they 

 are to remain for the winter. This presents many advan- 

 tages, not the least of which is the avoidance of all dan- 

 ger from the blasting of the buds by removal in the fall. 

 If plants are grown in the field during summer, the 

 benches should be provided with rich loamy soil, to 

 which it is best to remove the plants before severe frosts 

 prevail. By this time, if the plants have been carefully 



