THE MARSHES OF THE TEIKE. 627 
with the wealth conferred on him by healthy and vigorous 
breeds of cattle. 
On every side whence life emanates, Nature has sowed in 
profusion the germs of death. To make proper use of one, 
while we annihilate or neutralise the others, constitutes the 
incessant employ of succeeding generations. 
If the elements of destruction concocted within the vast 
elaboratory of nature often elude every investigation of 
human sagacity, some there are, on the contrary, whose ac- 
tion is so invariable, that their correlation, as cause and effect, 
admits of being framed into laws. 
Into this category of causes will enter such as are malarious 
in their origin ( martcages ). Though nobody disputes the 
grievous influence of paludian effluvium, yet are we too much 
in the habit of regarding it in a state of isolation : with few 
exceptions, medical men have not extended their views be- 
yond the human species, while veterinarians have confined 
theirs to domestic animals. The indissoluble laws uniting 
man to animals whom he has domesticated, subject them to 
the same natural phenomena: the good or the evil expe- 
rienced by one becoming equally the lot of the others. 
The comparative study of these morbid causes, and of the 
effect they produce on the different species of varied organi- 
sation, allows a vast field for investigation. In proportion as 
this field be gleaned, it becomes apparent how capable brute 
pathology is of lending aid to human medicine, in the same 
manner as comparative anatomy renders service to physi- 
°i°gy- 
At the same time, it is necessary that etiology, a branch of 
medical science still so obscure, should quit the beaten 
track. The study of morbid causes cannot acquire any posi- 
tive base without calling to its aid nosological geography. 
This scientific branch teaches us the reason why certain dis- 
eases are found in certain countries and certain climates, 
while elsewhere, in situations where the same conditions are 
found in less intensity, or are absent, the same diseases ex- 
hibit either only traces of this existence, or are unknown. 
Dr. Anzelon has entered on this fertile path. He practises 
in a country wherein marsh land constitutes the surface for 
several miles, communicating with the swamp of Lindre- 
Basse. He in a general manner demonstrates the gradation 
from intermittent fever to the fatal typhoid fever of man, and 
from the aqueous cachetic to the fever charbonneuse of animals. 
Paludian miasm, to generate influences so varied, must meet 
with an agent augmentive of its power, which agent is heat. 
Under the influence of humidity, it gives rise simply to in- 
