TR 
OF THE LEAVES OF BRITISH GRASSES, 957 
The leaves show none of the features which are usually regarded as characteristically 
alpine, such as hairiness, smallness (in connection with the stunted habit of the 
plant) &e. The one feature that the leaves possess in common is that they are usually 
rather thick. 
The faet that the leaves have undergone practically no modification in structure to 
fit them for their environment has already been shown in the second part of this paper. 
We have there seen that Phleum alpinum has practically the same leaf-structure as 
P. pratense (compare PI. 39. figs. 46 & 52), that the leaf of Alopecurus alpinus has a 
structure very similar to that of 4. geniculatus (Pl. 37. figs. 21 & 25), that Poa alpina, 
P. vivipara, and P. nemoralis, var. Balfourii, have the same leaf-strueture as Poa 
pratensis and P. annua, and that the leaf-structure of Avena alpina and A. pratensis 
is practically identical. It is thus quite clear that in the change from a lowland 
to an alpine environment, no modification of leaf-structure (or practically none) 
has taken place. 
In conclusion, I have to express my thanks to Professor Marshall Ward, who first 
interested me in this work—not only for this, but also for his advice throughout the 
research; and to Mr. J. Lewton-Brain, Mr. R. H. Yapp, and Mr. H. A. Denham, for 
specimens of grasses from different parts of the country. 
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