The main currents of zoölogy . FIG. 27.—\V. T. G. MORTON (1819-1868) From Camacs Epoch-Making Contributions to Medicine FIG. 28.—EDWARD JENNER (1749-1823) A CHAPTER ON INSECTS 137 1. The particular organism producing the diseaseis not known—probably because it is too small formicroscopic observation. Nevertheless, it is demon-strated that there is something in the blood thatproduces the disease. This something is assumed tobe of animal nature—owing to the requirement oftwo hosts and a relatively long time to complete itscycle. For want of a better name it is designated avirus. 2. The demonstra
The main currents of zoölogy . FIG. 27.—\V. T. G. MORTON (1819-1868) From Camacs Epoch-Making Contributions to Medicine FIG. 28.—EDWARD JENNER (1749-1823) A CHAPTER ON INSECTS 137 1. The particular organism producing the diseaseis not known—probably because it is too small formicroscopic observation. Nevertheless, it is demon-strated that there is something in the blood thatproduces the disease. This something is assumed tobe of animal nature—owing to the requirement oftwo hosts and a relatively long time to complete itscycle. For want of a better name it is designated avirus. 2. The demonstration that it can not be trans-mitted by clothing, bedding, contact with the sicknor through the atmosphere. Prior to 1898 it wasgenerally believed that these were sources of infectionbut two young privates of the United States army—John R. Kissinger and J. J. Moran—volunteered toput the question to a practical test, and for twentynights they slept in contact with bedding and nightclothing removed from those sick an
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