240 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



To this cross belongs Stewartii, Ratcliffiana, and Wrigleyana 

 distributed by ourselves ; also robusta, Outramiana, Williamsii, 

 coccinea, Donnaniana, atrosanguinea, and others distributed by 

 Williams. 



Besides these ten hybrids, we have at Chelsea the progenies 

 of other crosses that have not been named and are not yet 

 ready for distribution ; they include one primary hybrid, of 

 which both parents are species ; two secondaries, of which one 

 parent is a species and the other a hybrid ; and two tertiaries, 

 of which both parents are hybrids, an intermixture of forms 

 rapidly approaching that reached in the hybridisation of Orchids. 



It may here be remarked of the majority if not of all of 

 these hybrids that having been raised under the artificial condi- 

 tions of a glass structure in this country, they have adapted 

 themselves to those conditions with far greater facility than 

 many of the species brought from the equatorial region. Of 

 course there are well-known exceptions in those species that 

 have long been denizens of our houses, as Rafflesiana, Hookeriana f 

 ampullaria, Khasiana, Phyllamphora, &c. Although no hybrids 

 derived from present resources can ever supply the place of such 

 species as Rajah, Edwardsiana (Fig. 55), villosa (Fig. 56), and 

 Loivii, the results of present and future hybridisation are doubt- 

 less destined to be the predominant factors of the Nepenthes in 

 a horticultural sense. Eegret may be felt for the disappearance 

 from gardens of species that have been introduced, but the horti- 

 culturist whose object is to render available for general use 

 plants of the greatest interest or beauty that can be grown with 

 the greatest facility must necessarily devote his time and labour 

 to the cultivation of such. 



It is now time to turn to the plants themselves and to note 

 such features in their life-history as should come within the cog- 

 nisance of all cultivators of them. 



The embryo of the seed is not distinguishable even with the 

 aid of an ordinary pocket lens, but under the microscope it is 

 seen to be differentiated into an exceedingly minute axis and two 

 relatively large cotyledonary leaves. The seeds are usually 

 sown on the surface of a compost of peat fibre and chopped 

 sphagnum, in pots drained to three-fourths of their depth, and 

 placed in a closed frame in a glass house in a temperature of 

 21°-24° C. (70°-75° F.). Under these conditions the cotyledons 



