228 



THE CANADIAN HORTICULTURIST. 



crosses of this kind, and tliat no undesirable 

 qualities can be eliminated. 



Nevertheless, it indicates what crosses to 

 avoid. It also shows the danj^i'er of o;row- 

 ing a s])ecies and its variety in close prox- 

 imity if they hybridize easily. Thus if a 

 blue and a white tlowered variety are grow- 

 ing side by side im])urities are sure to occur 

 \\\ the seeds of both. ( )f course the white 

 variety can be purified readily, for on sowing 

 the seeds- the hybrids will reveal their pres- 

 ence in the crop by their blue flowers ; but 

 it is different with the species, for the blue 

 flowers of the hybrids will pass undetected 

 among the blue flowers of the species. 



From a theoretical standpoint the dis- 

 covery was of tremendous im]:)ortance. It 



was a beginning of the unravelling of the 

 difificult problems of hybridization. it 

 .showed how new types may arise in undis- 

 turbed nature. It opened up a line of ex- 

 perimental work on heredity and evolution, 

 the first valuable experimental contribution 

 to these subjects since the time of Darwin. 

 It indicated methods of research which if 

 prosecuted promised a flood of light on the 

 ])rocess of evolution. 



Research on hybridizing has become ac- 

 tive in recent years. Every earnest ex- 

 perimenter can help towards their solution 

 if he employs careful methods. But it must 

 be pointed out that if the methods are to be 

 of any value they must be statistical and 

 kept with great care. 



HOW TO MAKE CITY GROUNDS ATTRACTIVE* 



MAYOR J. A. ELLIS, OTTAWA, ONT. 



BESIDES trees and climbers, shrubs quite a sufticient list to choose from. The 



are a very important feature of land- best shrubs for the Ottawa district arc 



scape gardening. L'ufortunately we in Ot- Hydrangea Paniculata Grandiflora, Philadel- 



tawa are a trifle too far n,orth for many phus Coronarius( Mock Orange or Svringa)^ 



shrubs which thrive and grow most luxu- \'iburnum Opulus Sterilis (Snowball), sev- 



riantly a little farther south. Still, we have eral spiraeas, of which \'?n Houttei is as 



A Mass of Bloom Hiding a Fence in a City Garden 



A portion of the garden of Mr. J. E. Northwood, one of the winners in the Lady Alinto garden com- 

 petition, held in Ottawa for several years, is here shown. The flowers to be seen are a collection of seme 

 of the easiest grown and freest flowering plants ; such as petunias, gladiolus, coreopsis, some of the better 

 class of perennial phlox, and others, all of easy culture and effective colorings. 



*Continued from the May Issue. 



