摘要:

Over 400 hybrids involving 28 North American genera of forest trees are described in tabular form with the object, primarily, of providing useful information for the forest-tree breeder. The genera involved are:Abies,Acer,Aesculus,Alnus,Arbutus,Betula,Carya,Castanea,Catalpa,Cyprus,Crataegus,Cupressus,Gleditsia,Ilex,Juglans,Larix,Magnolia,Picea,Pinus,Platanus,Populus,Quercus,Robinia,Salix,Taxus,Tilia,Tsuga, andUlmus.

ISSN:1923-4287    

DOI:10.1139/cjr39c-040

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Marquis wheat was immersed in solutions of formaldehyde and formaldehyde containing either naphthylacetic acid or oestriol in concentrations of 0.1, 1, 5, and 10 p.p.m., and germinated on blotting paper or grown in soil at a temperature of from 70 to 75° F. A measure of physiological activity was shown by both chemicals from the results of germination on blotting paper; the activity of the two chemicals was of the same order. Growth in soil failed to show anything but injurious effects from formaldehyde.In another experiment, Marquis wheat was sprinkled with solutions of formaldehyde and indolylacetic acid and grown in soil at a temperature of from 50 to 55° F. The sprinkling treatment, which supplied one part of indolylacetic acid to a million parts of wheat by weight, reduced formaldehyde injury in a statistically significant manner. Lower concentrations of the chemical did not reduce injury to a significant extent.

ISSN:1923-4287    

DOI:10.1139/cjr39c-041

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Flour stored in sealers in a refrigerator at 2 °C. did not change in quality for 22 months after milling. Similar flours stored in sealers at room temperature deteriorated significantly within three months, while a third lot stored in small bags at room temperature showed first a definite improvement and then rapid deterioration. At the end of 22 months flours stored in sacks were much the poorest. Acidity of all flours increased with storage, but this determination was of little value in estimating flour quality.

ISSN:1923-4287    

DOI:10.1139/cjr39c-042

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Previous work by the author on the water contents of Canadian trees is reviewed and followed by a brief discussion of questions yet to be answered.InBetula alba v.papyrifera, in at least the young parts ofB.alba v.pendula laciniata, inB.populifolia, and in several sizes ofPopulus tremuloides, there is a marked seasonal rhythm in water content. The maximum is at leaf opening, the minimum at leaf fall. In poplar but not in birch there is a very high water content in December. During winter a considerable loss of water may occur. A winter loss is shown also by the wood of hemlock and larch and by twigs and leaves of white pine and hemlock. Losses from leaves are surprisingly small.The behaviour ofB.populifoliahas been studied for more than three years, and differences have been correlated with observations on weather conditions. Experimental work on movement of water in this species during winter is inconclusive. This work continues.

ISSN:1923-4287    

DOI:10.1139/cjr39c-043

出版商:NRC Research Press    

年代:1939

数据来源: NRC