Man Against Microbe

Spirochaetes and Actinomycetes admitted into a "Textbook of Bacteriology," why exclude the Sporozoa and the Trypanosomes? Should we not rather adopt the teaching of Theobald Smith with emphasis on "parasitism" as a major biological fact, presenting all parasites wherever found in either the animal or vegetable kingdom? I must also record that less attention has been given to the revision of the important section on the "General Biology of Bacteria" than to those portions dealing with specific microorganisms. But you will be aware that the critic must "carp." This is an excellent book, one of the "few to be chewed and digested." PAUL F. CLARK.