Yellow earth, a soil of serious phosphate deficiency, was used in this trial. Pot-culture experiments on the effect of appling a phosphatic fertilizer to wheat gave the following results: 1. Applications of phosphate 30 days after sowing gave the same yield as when the application was made at seeding time. 2. Later applications of phosphate successively caused lower efficiency. The times of ear emergence and ripening were delayed. 3. The concentration of P(2)O(5) in wheat tissue was suddenly increased to about 0.95% after each addition of phosphate. A large excess of phosphate present in the soil did not increase the concentration of phosphoric acid in plants above this figure. 4. Where the phosphate was applied at later stages of growth, more phosphoric acid was retained in the straw. 5. A deficiency of available phosphorus in the soil, not only reduced the yield of wheat, but also diminished the concentration of phosphoric acid in the plant cells. 6. The presence of a small amount of available phosphorus in the soil made later applications of phosphatic fertilizer much more efficient.

In a study of 55 clonal lines of Fairway crested wheat grass and 76 clonal lines of Parkland brome grass, widely significant differences were obtained in percentage of total carotenoid pigments, beta carotene, and total chlorophyll. The strains studied varied significantly in yield on a green weight basis. No significant relationship was found between the concentration of chlorophyll or carotenoid pigments and yielding ability. Significant correlations were obtained between the concentraiton of total chlorophyll and either total carotenoids of beta carotene.

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. | I. Two of the main Senecio species responsible for "breadpoisoning" in human beings in the Cape South-Western districts, viz., S. ilicifolius Thunb. and S. rosmarinifolius Linn., have been chemically examined for their toxic principles. II. From S. ilicifolius Thunb. a known alkaloid, Senecionine, C₁₈H₂₅O₅N, previously isolated by other workers from S. vulgaris, S. viscosus, S. squalidus and S. aureus, has been obtained. III. Senecionine is a stable alkaloid with m.p. 232° and very sparingly soluble in water. The alkaloid will not be destroyed during the baking of bread from flour of contaminated wheat. IV. S. rosmarinifolius Linn. contains a new alkaloid for which the name "Rosmarinine" is proposed. It has the formula C₁₈H₂₇O₆N, the melting-point 208°, it is extremely bitter and very sparingly soluble in water. It must be considered a dangerous poison when wheat becomes contaminated with S. rosmarinifolius or when animals graze on this plant. V. Rosmarinine has a specific rotation of -120.0° in chloroform and -94.0° in ethanol. Its nitrate has a melting-point of 218°C. and a specific rotation of -91.5° in water. VI. As a result of this chemical investigation and the nature of the toxic principles, the author urges the complete eradication of these Senecio plants which unfortunately occur very abundantly. This is considered the only remedy to prevent human deaths due to "bread-poisoning" and animal losses from chronic liver-cirrhosis.

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. | By means of metabolism experiments on mature and young sheep it was shown that approximately 81 grams of maize will supplement April grazing successfully in respect of protein if the energy requirements are satisfied. Due to the fact, that 150 grams maize efficiently supplement 200 grams of wheat straw with a lower nitrogen content than July grazing, it can be implied that it will also supplement July grazing successfully. Urea nitrogen has been shown to be utilized by sheep for maintenance purposes hut must not be expected to promote growth unless experiments conducted under controlled conditions prove the contrary.

Henry Shands of the National Center for Genetic Resources Preservation donated 27 3"x4" lantern slides related to farming. Images show experimental fields and farming equipment. There are no dates on the slides.