Our constant experience with diseases of an infectious and pyretic nature, serves to strengthen our belief that these conditions are the offspring of living germs; and as this conviction dawns upon us, we are forced to acknowledge that through these minute organisms the animal and vegetable life are indissolubly connected. It is not the nature of the "microbe" to remain upon his native soil,—whatever that may be—but, using the air as a vehicle for his transportation, finds himself equally at home upon the foliage and fruit, and in the food we eat, as within the human organism. The animal and vegetable kingdoms alike furnish him a suitable nidus for his propagation.
At no period in the history of medicine has the spirit of investigation shown so much persistency and unanimity of effort as is now being carried on over the whole civilized globe. Science,—in its every department—is taking an interest