Volume 7, Issue 1
January 1938, pages 1-48
pp 1-21 January 1938
The total material dealt with in the paper is not large, and that small series are being used to represent very large populations. It is also less valuable than it should be owing to differences in methods of measurement, and some uncertainty as to whether data collected by different observers are truly comparable even in cases where they followed the same technique. It seems to be safe to assume that certain of Risley’s measurements can still be used with profit, and that his means are not affected very markedly owing to the fact that the subjects were selected. Above all the number of characters used is not sufficient to give reliable estimates of racial affinity. Recognising these limitations it appears to be adequately demonstrated that four distinct ethnic groups are represented by the series considered,viz.,
Saoras (possibly allied to Oraons and others).
Hos, Mundas and Bhumij (Austric-speaking).
Kayasthas and Brahmins.
These four appear to be quite distinct, but it is extremely probable that there are transitional types between some pairs of them, and data for these will be required in order to reveal their ethnic relationships.
pp 22-35 January 1938
The present paper deals mainly with the effect of various chemicals (asparagin, KNO3, acid, alkali and C/N ratio) on the production of perithecia in a species ofRosellinia and supplements the results given in a previous paper (Das Gupta, 1937). The stimulating effect of a bacterium on the formation of perithecia is briefly dealt with.
The following are the main points:—
Thenumber of perithicia formed in a medium decreases with the increase in the concentration of asparagin, potassium nitrate, acid and alkali. In simple agar medium the higher agar concentration the greater the number of perithecia formed. Innumerable perithecia appear in media combining relatively high content of potassium nitrate with moderate amount of glucose.
Thesize of the perithecia is only slightly reduced in media combining relatively high concentration of asparagin and potassium nitrate with low concentrations of glucose. The size is greatly reduced in the media where KNO3 content and glucose content are both relatively high.
Addition of glucose in a medium having relatively high KNO3 content has adeleterious effect on the production of asci and ascospores.
Development of perithecia is inhibited much before the vegetative growth of the fungus is retarted due to high concentrations of chemicals except in the cases of the acid and alkali series where the perithecia develop as long as vegetative growth is not totally checked.
Regional distribution of perithecia in different modified media is briefly dealt with.
pp 36-40 January 1938
A microscopical study of the development ofTrichogramma minutum riley (the egg-parasite of the sugarcane borers in Mysore) and its parasitisation of the eggs ofCorcyra-cephalonica staint (the flour-moth employed in the mass production ofTrichogramma
pp 41-46 January 1938
pp 47-48 January 1938