Active and Passive Immunization in Typhus Fever.

Inspection of the paleontologic history of many phyla shows that when certain members of a series of polyisomeres have been subjected to in-. creasing stresses through long periods of geologic time, they have often become enlarged, strengthened or fused with their neighbors and have thereby passed into a state of anisomerism. Thus taxonomy, paleontology, comparative anatomy, genetics, experimental biology, physiology and allied sciences may find new common grounds in tracing the history and behavior of polyisomeres, anisomeres and hyperpolyisomeres.