In this paper the results of previous researches are extended and equations developed by means of which the resistance to fluid flow offered by a bed of spherical or non-spherical material may be computed with reasonable accuracy. The equations cover a range of porosity of the bed from 30 per cent to 90 per cent and practically the whole of the technically important range of Reynolds number, while particle shapes ranging from spheres to hollow cylinders, shell insulators and wire nails are covered. A new curve for wall-effect, depending upon Reynolds number, is also included. It is believed that the present work is of more general application than any which has previously been suggested.

No abstract

No abstract

No abstract

No abstract

Asphodelus microcarpus S a 1 z m. et V i v i. belongs to the family Liliaceae which is one of the families rich in medicinal plants. It includes several genera which were reported (W a t t and B r e y e r-B r a n d w i j k , 1962) as remedies in folk medicine; their value in this respect has been attributed to various constituents (alkaloids, anthraquinones, glycosides. .. etc.

d e l -B a r y The family Araceae is represented in Egypt by four genera viz. Pistia, Arisarum, Biarum and Eminizrm. Arisarum and Eminium are of the most common terrestrial genera and each is represented in Egypt by one species viz. Arisarum vulgare T o r g -T o z z var. veslingii (S c h o t t) E n g 1. and Eminium spiculatum (B 1 u me) K t z e (= Helicophyllum crassipes S c h o t t).This paper deals with the chemsitry of these two wild Egyptian species. Experimental and Results Material1

No abstract