166 
CAUSES OP PBVEK. 
are probably the predisposing causes ; secondlj, in its 
influence in developing the disease on those directly 
exposed to its power, wliich in nearly all those so 
situated, w'as followed almost immediately by an 
attack of fever ; thirdly, in its pernicious effects 
on those in whom the malady has commenced; as 
was most clearly exemplified on the 12t]i and 20th of 
September, when an unclouded sky, enabled the sun’s 
rays to operate with the greatest intensity. In con- 
firmation of these opinions, we quote some interesting 
remarks from the journal of the pious and gifted 
Bishop Heber. Speaking of tlie pestiferous jungles of 
Tandah and Terai, between Sheshgur and Kulleanpoor, 
in the East Indies, lat. 28" 30' N., long. 79“ E., he 
says, that “ during tlie heaviest rains, while the water 
falls in torrents, and the clouded shy tends to prevent 
evaporation from the grownd, the forest may be passed 
with tolerable safety. It is in the extreme heat, im- 
mediately after the rains have ceased in May, the 
latter end of August and beginning of September, that 
it is most deadly; that during the sickly season, from 
the 1st of April to October, even the animals desert 
them ; but in the latter month they return.” He says 
further, that “the people dwelling in the neighbourhood 
of these woods, call the white mists which emanate 
from the marshes, ‘the essence of owl,’ the native 
name for the jungle or malaria fever^h” 
* Heber’s Journal, vol. i., p. 251. 
