Volume 42, Issue 6
December 1955, pages 239-340
pp 239-248 December 1955
A. occidentale has become completely naturalised in India since its arrival just over three centuries ago.
There are varieties and races of the species which differ from one another in many respects. In view of the differences in the quality and size of the fruit, time of flowering of the tree and development of fruits, a careful selection of varieties and races is essential for large-scale cultivation in order to ensure better yield of the fruit.
As the tree is capable of growing in sandy and stony soils under varying climatic and soil conditions, it can be grown successfully in many parts of India where the land is unsuited for most other crops. It is a drought-resistant species and its cultivation can easily be extended to dry zones where it can form a perennial crop which can thrive without irrigation.
In view of the nutritive value of the fruit and of the use of shell oil in industry, and the growing demand for kernels and shell oil in foreign countries, it would be advisable to extend the Cashew-nut plantation which can be considered as a waste land crop in India.
As the cultivation and industry require only the minimum of care and attention, the costs of production are considerably lower than those of most crops in India.
pp 249-257 December 1955
pp 258-282 December 1955
pp 283-292 December 1955
pp 293-299 December 1955
An account is given of the effects of infection in the digestive gland ofMelanoides tuberculatus (Müller) by a monostome larval trematode. The distinction into four types of cells of the tubules of digestive gland as seen in the normal uninfected gland is lost due to this infection. The columnar cells become squarish and may even change into a nucleated syncitial mass. Loss of calcium globules and cell granules together with the disintegration of the cell would impair the normal metabolic activity of the snail.
pp 300-310 December 1955
pp 311-315 December 1955
1. The vascular anatomy of three abnormal flowers ofSaraca indica with 5 perianth segments has been studied and compared with that of the normal ones with a 4-membered perianth.
2. The contention of the authors already published, that one of the 4 perianth segments of the normal flower is a double one is supported by the vascular anatomy of these teratological specimens.
3. The 2 “midrib bundles” received by the double segment of normal flowers supply adjacent separate members in the abnormal flowers.
pp 316-324 December 1955
A factor capable of effectively inhibiting the process of coagulation of plasma as well as whole blood has been isolated from the latex ofCarica papaya. Attempts were made at purification of the factor by adsorption and fractional precipitation with organic solvents. A comparatively pure product was obtained by cold acetone fractionation at a final concentration of 42 to 48%. It was found that there was no correlation between the residual proteolytic activity and the anticoagulant property of the factor. Some of the general properties of the anticoagulant factor have also been studied.
pp 325-333 December 1955
pp 334-340 December 1955
1. Field experiments were conducted in the paddy area of the State to study the effect of tank-silt on the structure of soil and its effect on crop yields.
2. Silts are observed to contain a much higher percentage of water stable aggregates (50–80%) than soils (10–30%).
3. The application of tank-silt to loamy and clayey soils results in an increase in the water stable aggregates while light sandy soils do not generally show any increase.
4. Observations made on a clay loam and a clay soil show that the addition of tank-silt increases the rate of nitrification. No nitrogen fixation was observed in these cases.
5. Increased yields obtained through the addition of tank-silt are due essentially to the extra nitrogen added and also to the improvement of water stable aggregates in loams and clays.