447 
Insectivorous Plants ( Part II). 
combines in a remarkable manner the good points of both 
parents, and few or none of their bad ones. Further, be it 
observed, the inheritance of these in a single form gives it an 
advantage over both parents which will go far to perpetuate 
it, and if the sexual organs are not specially weakened, the 
superiority will be complete. 
Now what the gardener has done artificially in the above 
case nature does often accomplish unaided. If, then, this 
holds true of Nepenthes and Sarracenia , it is highly probable 
that the results have a wider application. It must be freely 
acknowledged that the balance of evidence as furnished by 
the experiments of Kolreuter, Gartner, Wichura, and Darwin, 
is opposed to the above, but many factors have to be accounted 
for before a final conclusion can be reached. 
One very important outcome, however, of the microscopic 
study of hybrid pitcher-plants has been the demonstration 
that all the cells of these exhibit the peculiarities of both 
parents in blended fashion. It is not intended in this paper 
that these should be exhaustively studied ; we would merely 
refer in detail to the structural conditions presented by the 
interior of the tubes of a hybrid Sarracenia and those of its 
parents. 
Amongst a set of seventeen hybrid Sarracenias kindly sent 
me by the Curator of Glasnevin Botanic Garden, was one now 
known as 5 . Swaniana, the product of a cross between S. pur- 
purea and 5 . variolaris , the latter being the male parent. 
Tube-structure of S. Swaniana and of its parents. The 
surface-cells of the inner lid-epidermis, in parents and hybrid 
alike, are very wavy in outline. In S. purpurea 5-6 stomata 
can be seen in the field of No. 7 Leitz objective with No. 1 
eye-piece ; in 5 . Swaniana there are 3-4 ; and in 5 . variolaris 
2-3. The downward-growing hairs (Plate XIX, Fig. 6) of 
S. purpurea are long, stout, and with evident striae, there being 
15-16 commonly shown on surface-focussing of a hair. The 
hairs spring from greatly enlarged epidermal cells, and are 
mostly uniform in size, one in five only being rather reduced. 
Seven to eight appear in the field of No. 3 Leitz objective 
