21— On Plant 



By 



A. Griessen. 



Propagation. 



Through the varied means of plant propagation, Horticulture 

 has, to a large extent, reached its present high position. In 

 competitions between growers the results have been such that 

 we have greatly improved on the methods of increasing plants, 

 and it is also due to the advance in this art that our new 

 introductions are in most cases so rapidly distributed. First, 

 as to the 



Propagating= House. 



In the erection of a propagating-house, several things have to 

 be taken into consideration, for, without a suitable house, propa- 

 gation in many instances becomes a very difficult matter. The 

 plan shown in Fig. 614 combines several improvements. Heat, 

 moisture, and light are essential conditions in propagation. Any 

 kind of small house may easily be transformed into a propagating- 

 house at a very small cost, provided heat can be obtained when 

 wanted ; but in the erection of a new house, the first consideration 

 must be to find a suitable ground through which water will 

 drain easily. If this cannot be obtained, it would be advisable 

 to turn the soil over to a depth of 3ft. or 4ft., and put in good 

 drainage. The situation must also be considered. It is a good 



