No description available.

No description available.

Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

Québec Université Laval, Bibliothèque 2018

M.S.

Experimental work was done to determine a satisfactory method of making counters to be used in future research work, to develop a means of testing them, and to find a counter circuit which could be used in connection with this work and for demonstration work. / Master of Science

The ram C-1659 is the sire of more outstanding winners at the International Livestock Exposition from 1913 to 1938 than any other ram. Blendworth Herriard 45215, the sire of C-1659, is the most important sire of ewes the dams of winners at the same show. Concentrations in varying proportions of the blood of these two rams and other sons and grandsons of Goldmine, have produced more important winning sheep than any other blood or families used in the United States. As far as the age of either parent is concerned with Hampshire sheep, the offspring born at one age is no more apt to be a winner than the offspring born at another. A good breeding individual was apt to be so from the beginning. However, ewes for example, may respond very differently to two rams of unlike breeding as far as quality of offspring is concerned. Rams may differ in their ability to transmit desirable characteristics to their offspring on the basis of sex of the offspring. Some may sire better ewes, while some may sire rams of superior quality. This work suggests that there may be a 1:3:1 ratio among outstanding rams so that of five sires randomly selected, one would sire superior ewes, one superior rams, and three could do both equally well. / Master of Science

In the production of most farm crops, emphasis is placed on yield per acre. Other things being equal, the higher the yield er acre the lower the per unit cost of production. But in the case of flue-cured tobacco, emphasis is placed primarily on quality. Yield per acre is, of course important, but it must be sacrificed if and when it is obtained at the expense of quality. In the production of flue-cured tobacco both yield and quality play equally important roles. The better the quality of the crop the higher the price per pound, and the higher the yield of good quality tobacco the greater the value per acre. / Master of Science

For several years some of the graduate students, under the supervision of Dr. Scherer, have been investigating the chemical, or physical, reactions which take place in xanthation of soda cellulose. Following the previous work carried out by Scherer, Miller (1), Lin (2), and others in determining the effect of various factors (i.e. effects of temperature and aging) on rate of xanthation, the purpose of this investigation was to determine the effect of bulk number, or degree of mechanical subdivision, on rate of xanthation. In studying this it was hoped to find additional information on the relation between structure of soda cellulose and its reactions with carbon disulfide. It is possible to eliminate the factor of mechanical subdivision from consideration of the rate of reaction between CS₂ and soda cellulose. The only apparent effect is that the denser material offers greater resistance to solution and in that way very slightly modifies the degree of xanthation owing to the necessity for a somewhat longer dispersion period with the resultant possibility of decomposition. The effect of bulk number variation on either rate of reaction, or distribution of the carbon disulfide, was well within the limit of experimental error and may be disregarded. / M.S.

A method of extracting gallium from a Virginia feldspar has been determined. The steps in this method are: 1. Grinding of the ore to a very small particle size (200 mesh) 2. Extraction of gallium by “leaching” the ore with sodium hydroxide 3. Acidification of the sodium hydroxide solution with hydrochloric acid and subsequent extraction of the acid solution with ether to separate the gallium from aluminum, vanadium, and titatium, and other metals 4. Removal of iron by precipitation of ferrous sulphide with hydrogen sulphide 5. Precipitation of gallium by cupferron 6. Ignition of the cupferron precipitate to gallium oxide / M.S.