Volume 67, Issue 3
March 1968, pages 97-140
pp 97-103 March 1968
The processes by which the movements of the surface of the earth due to its rotation around the polar axis can influence the atmosphere above are considered in detail. It emerges that the fast-moving areas in the equatorial belt on the surface of the earth play a highly important role in determining the behaviour of the atmosphere. The jet-stream in the sub-tropical regions, the westerly zonal winds in the region of middle latitudes and the easterly surface-winds in the equatorial belt are explained on this basis and shown to stand in close relationship with each other. The winds observed in the polar belt are also discussed and explained.
pp 104-113 March 1968
The cephalopodsSepioteuthis arctipinnis andSepia aculeata show two peaks of activity in the year suggesting that they breed biannually. The gonad index ofS. arctipinnis is high during March and October and inSepia aculeata between February and April and July to August. Further, with the increase in the gonad index there is also an increase in the digestive gland index suggesting that they are probably directly correlated.
pp 114-118 March 1968
A new speciesOmmatobrephus bengalensis from a common snakeNatrix stolata (Linn.) has been described.O. lobatum najii Mehra, 1931,O. nicolli Gupta, 1954 andO. chauhani Dwivedi, 1967 are considered synonyms toO. lobatum Mehra, 1928. A key to the valid species of the genusOmmatobrephus Nicoll, 1914 is also given.
pp 119-124 March 1968
pp 125-128 March 1968
The mutagenic efficiency of radiations (fast neutron, gamma- and X-rays) and chemical mutagen (EMS) was compared on induced autotetraploid barley. It was found that only EMS was effective in inducing chlorophyll mutations in the M2 generation. The theoretical basis of this finding is discussed.
pp 129-131 March 1968
The total sugars in the leaves, roots and the root-knots ofAcalypha indica infected with the root-knot nematode were studied and compared with similar studies on the uninfected plant. It was observed that the sugar values were lesser in the infected plant compared to the uninfected plant. In the infected root system itself, the root-knots showed lesser amount of sugar compared to the non-knotty portions adjacent to the root-knots.
pp 132-140 March 1968
The hypercalcemic and hyperglycemic factors of the eye-stalk ofScylla serrata (Forskal) have been shown to be responsible for maintaining high concentrations of calcium and sugar in the blood during proecdysis. On eye-stalk ablation, the withdrawal of calcium appears to be affected and this leads to an unsuccessful moulting and death of the animal. The significance of this phenomenon in relation to relevant evidences on the moulting process of crustaceans has been discussed.