_Mode of Infection Through Mosquitoes._--The most brilliant triumph in modern medicine, and one of the most creditable achievements of human ingenuity, has been the absolute demonstration that malaria is carried from man to man by means of the Anopheles mosquito, and that the disease can, in nature, be produced in absolutely no other way. This is not a theory, but it is a fact which has been demonstrated in its every detail beyond dispute, and we are now happily in a condition to reject our venerable notions concerning bad air, miasma, etc. Before describing the method by which infection takes place, it is well to say a few words concerning the mosquito that acts as a carrier of the disease, which may be easily differentiated from other similar gnats. The malarial mosquito has a body which is placed parallel to and almost on the same plane with the front portions of the insect, and as a consequence, when at rest on walls or other objects, the back of the body sticks out almost or quite at right angles with the surface upon which it is resting. The back portion of the common mosquito forms an angle with the front part of its body, with the effect that both ends of the insect point toward the object upon which it rests. There are still other differences that clearly differentiate the malarial from the common mosquito, but the one given ordinarily serves to distinguish between them. The malarial mosquito is pre-eminently a house-gnat, being scarcely ever seen in the woods or open, but may be found--oftentimes in great numbers--in all malarial localities, lying quietly during the day in dark corners of rooms or stables. This mosquito practically never bites in the day, but will do so in a darkened room, if a person will remain perfectly quiet; their favorite time for feeding is in the early parts of the night and about daybreak--all of which accounts for the fact, long observed, that malarial fever is almost invariably contracted at night. The malarial mosquito bites and then goes back to some dark corner where it remains quiescent for forty-eight hours, at the end of which time it again descends to feed. Contrary to the general opinion mosquitoes bite many times, and frequently remain alive for months--the malarial mosquito particularly living in cellars and attics oftentimes throughout the entire winter.