摘要:

An analysis of the crystal structure of thallium-tin alloys was carried out. It was found that the tin lattice constant had a maximum value at the eutectic point (42.5% thallium), while the superconducting curve showed a cusp-shaped minimum at this point and a peak at the solubility boundary. When tin was added to thallium a change from α to β-thallium was observed. This change is similar to that already noted in other alloys of thallium.

ISSN:1923-4287    

DOI:10.1139/cjr33-096

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

This paper presents the results of the measurement of the vapor pressure of vinyl acetate, over the temperature range from 0 °C. to the normal boiling point. The determinations were carried out on vacuum distilled samples with an isoteniscope, differing slightly in detail from that used by Smith and Menzies(7).The normal boiling point is 72.5 °C. The molecular heat of evaporation has been found to be 8211 calories. The equation which represents the results isTrouton's constant and the critical temperature have been found to be 23.8 and 228.3 °C.

ISSN:1923-4287    

DOI:10.1139/cjr33-097

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

The authors have investigated the yellow color observed when carbon disulphide was adsorbed by c.p. alumina at room temperature. The color is due to by-products of the reactions of carbon disulphide with residual water in the gel. The investigators of the CS2 + H2O reaction at higher temperature attribute the yellow to sulphur or aluminium sulphide. The color formed at room temperature is not due to either of these. The reaction products consist largely of hydrogen sulphide, water, and carbon dioxide, with small amounts of carbonyl sulphide and carbon monoxide. The yellow coloration has been found to be a mixture of sodium sulphide, sodium hydrosulphide, and sodium polysulphide. A mechanism is proposed for its formation.

ISSN:1923-4287    

DOI:10.1139/cjr33-098

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

As intermediates for obtaining unsymmetrical 1, 4-dibromides several tetra-methylene glycols have been prepared, using varied procedures. They are not tractable substances. Only one gave a dibromide that could be purified; the latter did not form a Grignard reagent when treated with magnesium in dry ether. Trimethylene chlorobromide gives a small amount of Grignard reagent.

ISSN:1923-4287    

DOI:10.1139/cjr33-099

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

The chemical examination of the alkaloids ofCorydalis aureahas shown an unusual complexity and of the total of more than ten alkaloids thus far isolated only six are now described. The record deals chiefly with the stems and leaves of the plant in which protopine was present in exceptionally low concentration (0.025%). Equally exceptional is its high concentration m the roots (1.6%).l-Tetrahydropalmatine constituted the largest fraction of the remaining alkaloids, and its present isolation is the first on record although thed-form was previously known. Two new and well-characterized alkaloids, which have been namedcapaurineandcapauridine, respectively, are isomeric and are best represented by the empirical formula C21H27O5N. Both contain one phenolic hydroxyl and four methoxyl groups, and yield on methylation non-phenolic bases which do not appear to be identical. The presence of two bases, bicuculline and bicucine, which were first recorded in this series of papers, has again been demonstrated.The constitutional analysis of the new bases, as well as the isolation and characterization of the minor alkaloids, is in progress.In an appended note it is shown that bicuculline and bicucine are closely related and interconvertible. The latter is the free γ-hydroxy acid of which the former is the lactone.

ISSN:1923-4287    

DOI:10.1139/cjr33-100

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

This paper describes the results of studies on the wild bees of Nova Scotia, which were carried out in connection with apple pollination investigations in the Annapolis-Cornwallis Valley, Nova Scotia.The biology of the Apoidea in general is reviewed from the literature, and a list of bees taken on apple bloom is given. As the members of the generaHalictusandAndrenawere found to be the most important native pollinators, the greater part of the paper is devoted to accounts of the habits and life histories of representative species.The members of the genusAndrenawere found to have a simple type, such as is generally found among solitary bees. The females provision the nest and then die; the larvae develop to the pupal stage in their underground cells, then emerge as adults the following season. All Nova Scotian species studied were one-generation forms.The bees of the genusHalictusshow a primitive social organization, more complex in some species than in others. The first brood consists of females only, which are apparently sterile and work at nest construction, the gathering of pollen, etc. They are followed later in the season by a brood of males and females; these females, after being fertilized, hibernate for the winter, while the males die in the fall. The hibernating habits of different species are described, and notes are given on some parasites and inquilines of the two genera.

ISSN:1923-4287    

DOI:10.1139/cjr33-101

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

The genera that constitute the Pucciniastreae display a wide variation in the type of teliospore produced, as well as in the time and place of production. From the standpoint of development, however, there is a general situation that is common. In all genera primordial cells are formed from enlarged hyphal cells of the mycelium. These give rise to teliospore initials which are in the epidermal cells inCalyptospora, Milesia, HyalopsoraandThecopsora, and are subepidermal in the other genera. These initials divide to form the mature teliospores, which are thick or thin walled, and few to many-celled. In all cases the teliospore is the product of a single primordial cell.The teliospores ofCalyptospora goeppertianaare formed from a perennial mycelium, which causes a witches' broom and hypertrophied stems on species ofVaccinium. The mycelium gives rise to primordial cells in the cortex just below the epidermis. Each primordial cell pierces the host wall above and the contents pass in to form the initial, which by growth and division becomes the teliospore. The mature teliospores are one- to four-celled, with a thickened, dark brown wall. Development is not simultaneous, but progressive, and the teliospores are first formed in the basal parts, moving slowly upward until every cell of the hypertrophied portion of the stem is completely filled. In four species ofMilesiathe method of development is similar. The spores, however, are thin walled, and are formed in the epidermal cells of the overwintered fronds of their fern hosts.Thecopsora vacciniorumis similar toMilesiain many respects. The teliospores are intra-epidermal, thin walled and multicellular. InPucciniastrumthe teliospores are subepidermal, and arise from primordial cells, as inCalyptospora, MilesiaandThecopsora. The teliospore initials are closely packed, and the mature spores may form extended crusts. The simplest type of development is found inUredinopsis, which is generally considered to be the most primitive of the fern rusts. Primordial cells are formed in the same way as in the other genera. These round up to form the initials, and cross walls are laid down to give the mature spores.From these studies two possible lines of development are suggested, both beginning withUredinopsis. One line would lead through the intra-epidermal forms, asMilesia, Calyptospora, etc., and the other through the subepidermal genera, asPucciniastrumandMelampsoridium.

ISSN:1923-4287    

DOI:10.1139/cjr33-102

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

In a moisture and grade survey of grain harvested by various methods in western Canada during the 1932–1933 season it was found that straight-combined wheat showed a greater percentage of tough and damp samples than either stook-threshed or swath-combined samples. Of 401 stook-threshed samples 3% were tough or damp; of 416 straight-combined samples 22% were tough and 3% damp; and of 211 swath-combined samples 8% were tough and 1% damp.With respect to grade, it was found that as a result of exposure to rains the average grade lowering was least for stooked grain and greatest for swath-combined grain.

ISSN:1923-4287    

DOI:10.1139/cjr33-103

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

Biological notes are given on six species of Tortricidae—Sparganothis directanaWlk.;Tortrix allenianaFern.;Cacoecia myricanaMcD.;Cacoecia parallelaRob.;Tortricodes horarianaWlshm. andPeronea cornanaMcD.: three species of Eucosminae—Epinotia lindanaFern.;Epinotia myricanaMcD. andAnchylopera semiovanaZell.: five species of Argyroplocinae—Exartema cornanumHeinr.;Exartema permundanumClem.;Exartema valdanumMcD.;Argyroploce albicilianaFern, andEvora hemidesmaZell.A comparative study of the setal pattern of both head and abdomen in the larvae of the above-mentioned species is presented and the main structural details of the pupae are also described. In this connection a critical comment on both Fracker's and Mosher's generic keys, based respectively on larval and pupal characters, is offered.

ISSN:1923-4287    

DOI:10.1139/cjr33-104

出版商:NRC Research Press    

年代:1933

数据来源: NRC