ENTOMOLOGY

FOREWORDIN May, 1918, a class was formed, among the entomologists of thecountry to study the recent developments in the entomology of disease,hygiene, and sanitation, for the purpose of equipping themselves for anyspecial service which they might be called upon to render during the war.The lectur~s were mimeographed week by week and mailed to the enrolledmembership, which numbered in excess of 500.The war emergency is over and the mimeographed lectures havepractically all been distributed. These lectures, however, dealt as muchwith domestic as with military problems, and they have now been completelyrevised up to date o~March 1, 1919, and are given forth as aseries of lectures dealing with the entomological problems of peace timesfrom the standpoint primarily of municipal, industrial, and householdproblems, and also with the hope that the course will be of assistance toteachers, and will stimulate research among investigators. Manyimportant topics have been omitted, for we cannot hope to present thewhole subject in a book of this size.This phase of entomology is one which is destined to become veryimportant as our knowledge of disease transmission increases. Thereare many unworked and insufficiently worked problems now in sight, andthese lectures will be found to suggest numerous possible lines of research.. I wish at this time to express my appr~ig.tion of the services ofMr. Jacob Kotinsky, who served as Secretary of the Class, and of my .collaborators in this course of leptures.As nearly as possible the International Rules of Nomenclature arefollowed, but in Entomology the practice had not been followed of enclosingthe original author's name in parenthGsis followed by the 'nameof the author responsible for the present combination, and it has beenimpossible in the present volume to obtain all of the necessary information.W. DWIGHT PIERCE.