McGill University Thèses et mémoires publiés en 1959

The studies on carcinogenesis in hamsters represent actually a relatively new field of development. Gye and Foulds were the first to induce experimentally sarcomas in hamsters in 1940. This was followed by sporadic work of Ashbell (1945) and Shrader (1946), who reported on spontaneous tumors in hamsters, and that of Crabb, who induced sarcomas by injection of 9, 10 dimethyl 1, 2 benzanthracene in 1946. The extensive studies of carcinogenesis were initiated by the work of Kirkman and Bacon (1952), who reported the effects of various hormonal factors in male and gonadectomized female hamsters.  Read more

This thesis presents a structural, mineralogical and alteration study of the Henderson copper orebodies, located in the Chibougamau region of Quebec. The orebodies were discovered early in 1956 as the result of drilling two holes on an electromagnetic anomaly. Approximately 90,000 feet of drilling in 1957 outlined some 4,750,000 tons of ore with an average grade of 2.01% copper, 0.057 ounces of gold per ton and with small amounts of nickel and cobalt. A road and causeway have been constructed to the site and shaft sinking is now in progress.  Read more

The development of microwave radio relay systems for providing long-haul channels for communications circuits and for broad-band television channels has resulted in a vast increase in the mileage of such systems in use, both in the U.S.A. and in Canada. In order to attain the utmost in reliability and performance, these systems must be carefully engineered, with particular attention to siting of repeater stations, and to path clearance. At the frequencies (2000-13,000 Mc/s.) in use in the microwave band, high towers must be employed in order to provide a "line-of-sight" transmission path.  Read more

The diprionid sawflies, the group to which Neodiprion swainei Middleton belongs, have been known to science for many years. Linnaeus listed two species in the Tenth Edition of his Systema Naturae published in 1758, and Ratzeburg in 1844 devoted thirty-four pages of his text to a discussion of the fifteen species he recognized. Thus long known as serious pests of the Pinaceae in Europe, the diprionids have attracted increasing attention in North America since the early decades of the twentieth century, coincident with the increased planting of large areas to pines and the rapid increase in exploitation of virgin forests.  Read more

This investigation deals primarily with the examination of the distribution of stress in the haunch of a glued laminated wood arch, and the comparison of test data and theoretical values based on the results of tests conducted on a simple beam of similar glued laminated wood construction.  Read more

The unperturbed values for neon 4f terms have been determined through observed separation of d-f lines in the Stark effect. The values given below agree rather well with those previously observed in infra red spectra or calculated. Probable errors are about 1 cm-1. [...]  Read more

An examination of the current and past literature reveals that there has been no lack of investigation on salivary glands, their secretions and secretory constituants. It is found, however, that of all the papers, monographs and theses dealing with the electrolytes present in saliva, only an insignificant number approach the subject of bicarbonate. Many explanations can be offfered for the apparent lack of interest in this ion, for the problems that it poses are considerable. [...]  Read more

The brilliant yellow afterglow shown by nitrogen activated in a discharge tube was first reported by Lewis (1) who studied its behaviour in 1900. He observed that the yellow emission persisted for several seconds after the discharge was stopped, and was able to show that this afterglow produced a banded spectrum identical with part of the N2 spectrum..  Read more

Not long after my arrival at Port Harrison, I participated in a joyous evening of Eskimo dance. I was struck by the athletic vigour of the dance, for example, the pressure with which the young women grasped my hand in the "grand right-and-left" that forms the chorus of every dance. Since I was enjoying myself immensely, I returned the squeeze to the girls with equal pressure. Late that night I wrote in my notes: "Eskimos dance with great vigour."  Read more

Previous research has shown that there is a decline in learning performance in old age. Just what factors may produce this loss is not known with any certainty. The older person may be a poorer learner because he forms new associations less rapidly, or because he retains them less well. If learning performance declines because new associations are acquired less rapidly, again, this may be due to lack of motivation or attention, or it may be due to decreased modifiability of the nervous system with age or lack of practice at learning.  Read more

The demands of present day industry for machines of ever increasing complexity and durability has accentuated the need for the improvement in the art of metal casting. This particular method of shaping metals has in fact become so expedient, that a concerted effort is being made to overcome the multitude of practical problems that still exist in the casting industry. Many of the solutions to these problems, particularly those concerning ingot quality, are only empirical and are not based on the knowledge of the fundamental mechanisms of solidification. [...]  Read more

The compound now known as cholesterol was first isolated by Poulletier de la Salle in 1770. The elucidation of the chemical structure of cholesterol was mainly due to the researches of Windaus and his associates, aided by the work of Wieland on the bile acids, and the studies of Suida and Mauthner on the derivatives of cholesterol. In 1919 Windaus arrived at a tentative formula which was changed, as a result of further work by Rosenheim, King, Dane, Diels and Gadke, and the final formulation as we know it today was decided upon in 1932.  Read more

A study was made of the dependence of the breakdown voltage VB of silicon diffused p-n junctions upon diffusion time, diffusion temperature and resistivity. A statistically planned experiment indicated that no other variables in the process have any influence upon the breakdown voltage. For a breakdown voltage up to 300 volts the junction still can be approximated as a linearly graded one. [...]  Read more

There is much evidence that Wise's chlorite method of isolating holocellulose from wood produces more degradation than does the chlorination- alcohol-pyridine method. Cotton cellulose, however, is degraded more by chlorination than with chlorite. The main object of this research was to determine whether the anomaly is connected with the 1-3% of pectic material that wood contains.  Read more