Volume 64, Issue 6
December 1966, pages 283-335
pp 283-292 December 1966
The quadrant proembryo ofEpithema carnosum Benth. consists of a spherical mass of four cells of which two opposite ones appear trapezoid in cross-section and the rest triangular. The inner faces of the quadrants are straight partitions while the outer faces are curved and converge towards the polar furrow. The primary adjustment facet is a median strip of cell wall which separates the quadrants. A transverse division of the quadrants results in the formation of the octant proembryo. The transverse cell plates are laid down in planes of minimal area in accordance with Errera’s Law and at slightly varying levels so that not more than three partitions meet at one edge. Due to subsequent readjustment, four lateral furrows corresponding to four new transverse primary adjustment facets are formed. In addition, a hexagonal secondary adjustment facet is formed in the centre of the sphere and separating the octants. This is formed from a strip of original primary adjustment facet of the quadrant proembryo. The octants have five to nine faces after readjustments. The shapes of the octants are determined by both surface tension and growth.
pp 293-295 December 1966
pp 296-300 December 1966
A study of the cataclastically deformed plagioclase from a fault zone reveals that the characteristic plagioclase twinning is destroyed in some way. It is presumed that twinning in plagioclase is an irreversible or thermodynamically unstable imperfection. It is concluded that cataclasis and the consequent induced twinning are pre-tectonic crystallisation features, while elimination of twinning is a post-tectonic deformational feature.
pp 301-313 December 1966
1. Fifty-three samples of freshwater fishes and prawns comprising twenty species from the States of Maharashtra, Gujarat and Bihar were analysed for their contents of calcium, potassium, phosphorus, copper and iron. The seven samples from Bihar were analysed, in addition, for uranium.
2. Significant differences were observed between fishes and prawns in regard to copper and calcium contents in edible portions. Thus, the copper content of prawns ranged from 4·62 to 13·11 ppm; while in the fishes the corresponding range was 0·13 to 3·19 ppm. The uranium content of the fish samples from Bihar was of the order of 0·2 ppm.
3. Data are also given on the analyses of the water samples and on Concentration Factors. The Concentration Factors are discussed with reference to the estimation of maximum permissible concentrations of the radioisotopes of the elements in water.
pp 314-319 December 1966
pp 320-333 December 1966
pp 334-335 December 1966
Diploid and polyploid races of commercially important species of the genusCymbopogon have been investigated for their oil contents. The polyploid races were found to be richer in oil content as compared to their diploid counterparts within species range.