. The Canadian horticulturist [monthly], 1905. Gardening; Canadian periodicals. 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 i
. The Canadian horticulturist [monthly], 1905. Gardening; Canadian periodicals. 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 (Snowba
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