摘要:

White and yellow birch trees produced an abundance of sap, but the yield of sugar was on the average only about one-third that of the sugar maple. Results indicate that yellow birch sap contains invert sugar with small amounts of sucrose, and that white birch sap contains a mixture of fructose and invert sugar. Syrups prepared from white and yellow birch saps by concentrating 100 times were similar in taste and appearance to commercial corn syrup.

ISSN:1923-4287    

DOI:10.1139/cjr44c-001

出版商:NRC Research Press    

年代:1944

数据来源: NRC

摘要:

Results of experiments performed in the greenhouse have shown that, under conditions of a high temperature especially when combined with a high humidity, melanistic areas may develop on the glumes, lemmas, peduncles, and internodes of Apex and Renown wheat in the absence of any infection by pathogenic organisms.

ISSN:1923-4287    

DOI:10.1139/cjr44c-002

出版商:NRC Research Press    

年代:1944

数据来源: NRC

摘要:

This is a contribution to an understanding of the floristic composition and ecology of the chief plant communities in the region. Three major grassland types are recognized and correlated with climatic factors, topography, and soil colour zones,— theBouteloua–Stipaassociation in the dark brown soil zone, theFestuca–Danthoniaassociation in the black soil zone, and theAgropyron–Stipa–Carexassocies in the intermediate shallow black soil zone. Of some 250 species and varieties of vascular plants found in these grassland communities, approximately 125 are regarded as either common or characteristic. Poplar and coniferous vegetation is considered in relation to climate, physical features, and the associated grassland. The limber pine and Douglas fir communities of rocky ridges in the "parkland" are described. Prairie and poplar associations are compared with corresponding vegetational types described for other regions. Brief consideration is given to probable migration routes of certain species, and to current fluctuations and trends in the flora of the region.

ISSN:1923-4287    

DOI:10.1139/cjr44c-003

出版商:NRC Research Press    

年代:1944

数据来源: NRC