Volume 1, Issue 12
June 1935, pages 817-937
pp 817-822 June 1935
A simple titrimetric method for the estimation of ammonium carbonate in the presence of urea has been worked out and employed for the study of the urea-urease systems.
The method consists in titrating the solution against standard acid after the addition of acetone and is an extension of Linderström-Lang’s method for the estimation of amino acids.
The method can be employed for the estimation of urea in urine and possibly in other biological fluids.
pp 823-836 June 1935
pp 837-856 June 1935
The presence of a chambered excretory bladder in some Echinostomatid genera is reported for the first time.
Two new species ofEchinochasmus, E. bagulai from the common pond heron and night heron, andE. ruficapensis from the Little Grebe or Diver are described, and their specific diagnoses are given.
The definition of the genusEchinochasmus is emended, and a suggestion thrown out for splitting it up into two sub-genera.
A new genusEpisthochasmus is created for a new species of parasitic Echinostomatid from the common dog of Calcutta. The generic diagnosis of the new genus and the new speciesE. caninum is given.
pp 857-867 June 1935
Dolichos lablab exists both as a field and as a garden variety. The latter has evolved out of the former. The downward hairs (H) in the internodes of the garden variety are a simple dominant to the upward hairs(h) of the field variety. Erect pods (E1, E2 or E1E2) are dominant to drooping pods (e1e2). Two factors exist, either of which or both might give erect pods. In the absence of both, pods droop. Pods of medium width (W1) proved dominant to pods of narrow width (w1). In narrow podded garden varieties the septate (S) condition of the pods proved dominant to the non-septate (s) bloated condition. In field varieties all pods are green in colour. In garden varieties pods may also be light green in colour. This difference is reflected in the whole plant. The normal green colour (Ca) is a simple dominant to the light green (ca).
pp 868-892 June 1935
pp 893-908 June 1935
pp 909-927 June 1935
pp 928-937 June 1935
The organic carbon contents of a number of tropical soils (from India, Burma and Ceylon) were determined. It was found that most of them—including some which are reputed to be fertile—are poor in that constituent as compared with the soils of temperate regions.
When a manure is applied to a soil (under tropical conditions), the increased benefit to the crop is more due to the decomposition of the added material than to greater availability of the original organic matter of the soil. The carbon content is not a correct measure of the possible availability of a manure. Addition of minerals may increase or depress the beneficial effects that may be derived through application of organic manures.
Treatment with minute quantities of chemical oxidisers such as permanganate, hydrogen peroxide or ferric oxide helps to increase the availability of the organic matter of the soil. In the case of barley, the effect is best seen if the seeds are sown shortly after the treatment. In the course of three weeks, the dry weights of seedlings are increased by over 50 per cent.
It has been shown that plants receiving a useful supply of farmyard manure (10 tons) can grow, at any rate in the early stages, independent of atmospheric carbon dioxide. The dry weights of seedlings receiving CO2-free air were of the same order as those receiving ordinary air.
The significance of the foregoing and other observations has been discussed.