摘要:

Microscopic examination of Alberta coals shows that they are composed principally of materials derived from the woody parts of plants. Many woody structures are visible in thin sections and on polished and etched surfaces. Spores are present in the coals, but are relatively few in number. The resin content varies considerably, attaining a high proportion in the cannel coals of the Crowsnest Pass region in British Columbia, bordering the southwestern part of Alberta. The correlation of seams in the Alberta coal deposits on the basis of their microscopical characters has not yet proved to be feasible. A wide field is open here for palaeobotanical research on the nature and classification of the plant structures visible in these coals by means of the microscope. The investigation described here may be considered as being relatively only a beginning to further work that should be done in the study of the microscopical features of Alberta coals by the geologist, chemist and botanist.

ISSN:1923-4287    

DOI:10.1139/cjr36b-032

出版商:NRC Research Press    

年代:1936

数据来源: NRC

摘要:

A method that renders titrations having indistinct color end points more accurate, and that makes possible their use with colored solutions has been developed. Application of the method to the problems of the sugar refinery gave satisfactory results.

ISSN:1923-4287    

DOI:10.1139/cjr36b-033

出版商:NRC Research Press    

年代:1936

数据来源: NRC

摘要:

A new technique has been developed for the purpose of studying, by means of vapor pressure changes, the effect of wood and cellulose on the system calcium-oxide–sulphur-dioxide–water. Preliminary experiments are described. A sample calculation has been made, to indicate that vapor pressure changes might be used to determine the relative rate of consumption of sulphur dioxide and calcium oxide during the cooking of wood. Cellulose does not yield carbon dioxide in appreciable quantities during cooking.

ISSN:1923-4287    

DOI:10.1139/cjr36b-034

出版商:NRC Research Press    

年代:1936

数据来源: NRC