Spectroscopic studies of hydrogen plasmas in a magnetic well

Experiments are described in which the containment times of plasmas in Andreoletti's modified theta-pinch apparatus are increased by the addition of an external D.C. field produced by a modified version of the "Tennis Ball Seam" conductor described by Larkin. The diagnostics used are all spectroscopic

An investigation into cases of suspected poisoning in Africans in Northern Rhodesia

No Abstract

Recent investigations into the toxicity known and unknown poisonous plants the Union of South Africa VII

The articles have been scanned in colour with a HP Scanjet 5590;300dpi. adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format

The toxicity of pumpkin seed (Cucurbita pepo L.)

(1) No experimental evidence was obtained to support the contention that pumpkin seed produces paralysis in stock. A young sheep drenched with large amounts of fresh seed developed transient diarrhoea. It is possible that pumpkins grown in different areas differ in their effects on stock. (2) The evidence found in the literature in regard to the value of the seed as a taenifuge is contradictory. It is possible that the ingredient (or ingredients), which is responsible for the effect of the seed as a taenifuge, varies in the specimens of pumpkin grown in different areas. (3) The fatty oil and the resin contained in pumpkin seed appears to be non-toxic to animals and human beings when given in moderate doses.The articles have been scanned in colour with a HP Scanjet 5590;300dpi. adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format

Experiments with plants alleged to be used as abortifacients and ecbolics by natives

The plants, which are alleged to be used abortifacients and ecbolics by the natives of Uganda, were submitted by the Director of Medical Services, Uganda, for investigation. It is stated that the pregnant women drink infusions prepared from about a handful of the leaves and roots of the plants and that their use is often attended with disastrous results. In the experiments conducted at Onderstepoort the infusions were prepared by extracting 40 gm of ground dry plants with 300 c.c. of tap-water for two hours at 50° C. On each clay of the experiment the infusions were freshly prepared before dosing. As the infusions apparently had no effect on the pregnant rabbits the plant material itself was administered also with negative results.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.Includes bibliographical referencesab201

The toxicity of trypan blue

It has been definitely proved that two out of three brands of Trypan Blue tested markedly increased in toxicity after the solutions had been left standing for ten days before injection. It is therefore obvious that only freshly prepared solutions of Trypan Blue should be used.The articles have been scanned in colour with a HP Scanjet 5590;300dpi. adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format

The occurrence of cyanogenetic glucosides in South African species of Acacia. I

(1) Cyanogenetic glucosides were found in five South African species of Acacia (A. giraffae Willd., A. lasiopetala Oliv., A. litakunensis Burch., A. robusta Burch., and A. stolonifera Burch.), whilst repeated tests conducted with the fresh leaves, flowers, and immature pods of Acacia karroo Hayne failed to reveal the presence of such a glucoside. The glucoside in A. robusta was not accompanied by an enzyme capable of splitting it. Certain processes of decomposition appear to destroy the enzyme, but not the glucoside in the shells of the pods (Acacia giraffae Willd.). (2) Methods are described of feeding the pods of species of Acacia, which contain cyanogenetic glucosides, to stock with safety. (3) A cyanogenetic glucoside has been isolated from Acacia lasiopetala Oliv. Its formula is shown to be C₁₁H₁₇O₆N. It has M.P. 176-7°, and [α]²²/D = - 35•96° , and does not correspond with any known cyanogenetic glucoside. The name Acacipetalin is suggested for this substance, the constitution of which will form the subject of a further communication.The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format

The toxicity of some dipping fluids containing arsenic and sulphur

1. Experiments to determine the toxic doses of some dipping fluids containing arsenic and sulphur are described. 2. It appears that in all the more common forms of arsenical preparations, which are soluble in water, the m.l.d. for rabbits can be calculated on the basis of approximately 0•014 gm. of As₂0₃ per Kg. of body-weight. Sheep, cattle and horses are more susceptible than rabbits to arsenic. 3. The m.l.d. of diluted (dipping-strength concentration) Capex Lime Sulphur Dip for rabbits is approximately 7.5 c.c. per Kg. of body-weight and for sheep approximately 15 to 20 c.c. per Kg. of body -weight. 4. In dipping-strength concentration Tarzan Lime Sulphur Dip and Nelson's Polysulphide Dip possess approximately the same degree of toxicity as Capex Lime Sulphur Dip.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.Includes bibliographical referencesab201

Note upon the isolation of the toxic principle from a species of Dimorphotheca, probably Dimorphotheca fruticosa

The cyanogenetic glucoside Linamarin has been isolated from a species of Dimorphotheca, probably Dimorphotheca fruticosa. The leaves of the plant contain approximately 1.5gm of HCN per 100gms.The articles have been scanned in colour with a HP Scanjet 5590;300dpi. adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format

Recent investigations into the toxicity of known and unknown poisonous plants in the Union of South Africa IX

The toxicity of thirty-three plants was investigated. According to the available literature the following ten plants were proved for the first time to be toxic: Lotononis laxa, Cotyledon coruscans, Cotyledon campanulata, Asaemia axillaris, Zygophyllum Morgsana, Urginea sp., Hymenocylus Smithii, Drosanthemum sp. probably D. hispidum, Chironia baccifera and Senecio sp. ab. Kraamwinkel, Settlers, July, 1937. It was also established that Dimorphotheca caulescens and Dichrostachys nyassana contain hydrocyanic acid. It is interesting to note that according to our present knowledge we can divide the poisonous species of cotyledon into three groups according to the symptoms caused by them, viz (A) those species (C. decussata, C. ventricosa, C. obovata, C. Wallichii, etc., containing cotyledontoxin), which cause “Krimpsiekte" (cotyledonosis), (B) those species (C. campanulata) which contain hydrocyanic acid, and (C) those species (C. coruscans) which cause pronounced gastrointestinal irritation (haemorrhagic enteritis). The active principle responsible for the severe irritation is unknown. The species of Cotyledon coruscans tested by us, however, also contained a small quantity of cotyledontoxin, but not in such quantities as to cause ''krimpsiekte''.The articles have been scanned in colour with a HP scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to final presentation PDF-Format.Includes bibliographical referencesab201