principles of the student of general biology, who has been universally neglected in favor of the more specialized student of infectious diseases. It is designed primarily for the college senior or graduate student in biology; the references are intended to be illustrative of points requiring special emphasis rather than exhaustive in scope. The preface states: "Many controversial problems have ...

T HE WALTER AND ELIZA HALL Institute of Medical Research in Melbourne, Australia is probably the world’s best known research center devoted to the study of immunology. This recognit ion was gained under the leadership of its third director, Sir Frank Macfar lane Burnet, who headed the Institute from 1944 to 1965. Subsequent ly, the Institute has shown explosive growth under the leadership of it...

Socrates and Meno reach two different conclusions: in the first part of the dialogue, that virtue is knowledge and can therefore be taught; in the second, that it is reliable true opinion and can therefore be acquired only by divine inspiration. Taking into account Socrates’ role as a teacher (of his interlocutors and of Plato) and Plato’s role as a teacher (of us), I show that neither of these...

This article has summarized parts of certain publica­tions about changes of hematopoietic elements, specially erythroid, during embryonic and fetal to the third postnatal life. The main purpose of this article is to familiarize medical students with the physiological characteristics of the blood system, chiefly in the first trimenon of postnatal life.  It is also aimed to prevent many incorrec...