The science of histology endeavours to achieve a knowledge of the detailed morphology of normal tissues. It is also concerned with relating the structure and function of biological (morphological) units at the microscopic level to their internal and external environments.

The most complete accounts of Lepidoperon embryology are by Toyama (1902), Eastham. (1927), Johannsen (1929), Gross and Howland (1940), Rempel (1951) and Presser and Rutschky (1957). There are many other papers that either deal with the development of only one…

The expanding use of wood pulp and pulp products has emphasized the need for increased basic knowledge dealing with the waste materials and by-products of the forest industries. Wood bark is one or the major byproducts. In the paper industry…

The need for continued investigation into the mechanism of motor function has been emphasized recently by Bucy (1957) in a critical review entitled, "ls there a pyramidal tract?" and by Lassek, Woolsey, Walker, and Boshes (1957) in a symposium of…

This historical introduction would have to be greatly extended if it were to deal with the details of the anatomical and physiological developments that led to our present knowledge of the reticular activating or arousal system. Recognition of its significance…

The magnitude of the problem of ascites is not readily apparent to the clinician. A classification of conditions in which ascites occurs and a consideration of therapy occupy his thinking when confronted by a patient with the sign. Those actively…

The problem of mixing of subsonic circular jets with stationary fluid and with a stream at right angle has been studied. The present knowledge and conventional methods of approach to this problem are described. Applying Elrod's momentum diffusion theory of…

The rapidly growing field of teratology has recorded an amazing variety of developmental aberrations, either "spontaneous", or with some more or less clear-cut genetic or environmental cause. This preliminary descriptive stage is certainly necessary as a guide to the further,…

Wheat, an important food crop of the world, suffers from a number of diseases which cause a heavy loss to the growers every year. Stem rust (Puccinia graminis tritici Eriks. and Henn.) is one of these serious diseases and it…

The work described in this thesis has contributed to scientific knowledge in the following ways: (1) For the first time it has been shown that the response of insect to poison gas at reduced pressures may follow a complex rather…