1 20 TRANSACTIONS AND PROCEEDINGS OF THE [Skss. lxvi. 



DiSTKIHUTION IN ALTITUDE. 



We pass to the distribution of tlie ilower-classes in 

 altitude, and here, in preface, it is to be remarked that 

 (i.) althougli al pines are common in the belt of 500 feet 

 between 2000 and 2500 feet, and many do not descend 

 below it ; (ii.) although various lowland plants pass above 

 1000 feet without overpassing the belt between 1000 and 

 1500 feet; and (iii.) although the belt between 1500 and 

 2000 feet holds fewer species than the belt above or the 

 belt below it, — the three belts of 500 feet between 1000 

 and 2500 feet are practically identical in the composition 

 of their floras by flower-classes. This is so much the case 

 that for simplicity we have grouped in the following 

 statements the three belts into one of 1500 feet: — 



Anemophilous flowers are proportionally most numerous 

 above 2500 feet — 



Aueiiiophilous. Eutoinophilous. 



No. Per cent. No. Per ceut. 



Above 2500 35 40-23 52 5977 87 



1000-2500 85 31-18 180 68-82 265 



Below 1000 94 31-55 204 G8-45 298 



The two tables which follow give the numbers and 



percentages of Entomophilous flowers of various classes. 



Table I. — Number of Entomophilous Flowers of A'arious Classes. 



Po A AB B B^ H F Total. 



Above 2500 2 G 15 8 9 11 1 52 



1000-2500 12 15 47 29 28 43 6 180 



Below 1000 10 21 44 35 31 51 6 204 



Table II. — Perceutago of Entomophilous Flowers of Various Classes. 



The following Classes increase upwards — AB, B^. 



,, ,, downwards — Po, B, H. 



In all our visits* to Clova, except the first two, we made 

 a point of counting the individuals of the various species 

 of insect which we saw visiting the flowers. We do not 



•>^ Visits to Clova. 



1894, July 5-9 (J. C. W. and I. H. B.). Weather unsettled. 



1895, April 1-17 (J. C. W). Snow at first covering all down to 



1000 feet, gradually retreating up the hills; nights 

 frosty. The preceding four months had been excep- 



