The best time of sowing for Cenchrus ciliaris, Elionurus hirsutus, Prosopis spicigera, Zyziphus jujuba and Zyziphus nummularia was experimented in Project Gauharwala and Dagar Kotli of Range Improvement Scheme, Thal, on flat plots, slopes and dunes. Sowing of seeds was carried out at different intervals of time between 1st May and 10th September. Results are tabulated which indicate that sowing from 1st July to 15th August gave the best result. Constituents of freshly-harvested, undried roots and root bark of R. caffra obtained from E. Pakistan and S. Africa, were investigated through a technique of dialysis with organic solvents.. Experimental details are given for the extraction of alkaloids. Raucaffricine seems to be the major alkaloid of root bark (yield 0.17%) whereas raucaffri ne (perakine) is the major alkaloid of thin roots (yield 0.11%) of R. caffra. Rauwolfine, reported by Koepfli could not be isolated from either of the samples.