ENTOMOLOGY

CHAPTER XXXVA Tabulation of Diseases and Insect TransmissionW. Dwight PierceIn VIew of the fact that a very large number of diseases have beenmtmtioned in these lectures, and that the same disease has often beenmentioned in several lectures, it was thought desirable to prepare atabulation of the information presented in this volume in the most concreteform possible. In the fourth column under method of insect transmission,I have drawn frequent conclusions as to the probable mode oftransmission, based on analogy. In each such case a modifying wordmakes it clear that the statement is not proven. Unquestionably we mustdraw such conclusions and test them out, for by such methods we cangreatly facilitate progress in investigation. Unquestionably in many ofthe diseases cited below, insect transmission is not the most importantmode, but on the other hand, I am just as confident that insect transmissionwill prove to be the most important mode in other diseases nowconsidered to be carried otherwise. In no wise in this entire course do Iclairn responsibility for proving insect transmission, nor am I able tojustly repudiate the claims made by others. The evidence is presentedfor what it is worth and occasionally with theoretical suggestions bymyself, but each reader must seek the original evidence and weigh it himself.Undoubtedly there are many inaccuracies of fact in this tabulationand in the chapters on disease transmission. Soml' of them may have beencorrected but overlooked in compiling the present work.There is always a danger that people will accept a tabulation asaqthoritative. It is not, in this case at least, a critical compilation.473