38 



THE ENTOMOLOGIST. 



indicated, at the sea-level, deduced from the excellent charts 

 imblished by the council of the Eoyal Meteorological Society 

 (see ' The Meteorological Atlas of the British Isles,' 4to, 1883, 

 price 5s., which I would recommend every intending student to 

 obtain). 



Proposed Veetical Zones in the British Isles. 



■■'- The temperatures here given have been reckoned to the nearest 

 degree. 



f On the Continent this zone terminates equatorwards at the annual 

 isotheim of 64-6, which is the northern limit of the olive or evergreen zone, 

 constituting the typical arboreal conditions of the Mediterranean region. 



I The summit of Ben Nevis represents a mean annual temperature of 

 about 32'5, but it must be understood that the heights in feet given in the 

 case of the higher zones, merely show the heights to which the belts in 

 question would ascend if the elevations were of a sufficient altitude. In 

 many cases, the highest mountains in each latitude only rise for a very little 

 distance into the latter zones indicated. 



