In fact, in numerous cases heat may be the means of removing the immediate sources of disease.

Its first perceptible effect is a slight increase, of the normal bodily temperature beyond 98 deg., and, simultaneously, an increased activity of all the vital functions.

To this everything contributes an exciting sympathy--the glad surprise of the natural scenery, the luxury of verdure, the tempting novelty of fruits and food, and all the unaccustomed attractions of a tropical home.

Under these combined influences the nervous sensibility is considerably excited, and the circulation acquires greater velocity, with somewhat diminished force.
This is soon followed, however, by the disagreeable evidences of the effort made by the system to accommodate itself to the new atmospheric condition.

The skin often becomes fretted by "prickly heat," or tormented by a profusion of boils, but relief being speedily obtained through these resources, the new comer is seldom afterwards annoyed by a recurrence of the process, unless under circumstances of impaired tone, the result of weakened digestion or climatic derangement.
_Malaria_ .-- Compared with Bengal and the Dekkan, the climate of Ceylon presents a striking superiority in mildness and exemption from all the extremes of atmospheric disturbance; and, except in particular localities, all of which are well known and avoided[1], from being liable after the rains to malaria, or infested at particular seasons with agues and fever, a lengthened residence in the island may be contemplated, without the slightest apprehension of prejudicial results.
These pestilential localities are chiefly at the foot of mountains, and, strange to say, in the vicinity of some active rivers, whilst the vast level plains, whose stagnant waters are made available for the cultivation of rice, are seldom or never productive of disease.