• Volume 30, Issue 1

      July 1949,   pages  1-60

    • Errata

      P S Sreenivasan

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    • A study of genetic variability in central India durum wheats

      K M Simlote

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      Sixteen samples of the localdurum wheat from States in Central India were grown in a randomised varietal trial with five blocks for studying the genetic variability in the localdurum wheats. One hundred plants distributed evenly over all the replicates were labelled after the germination was complete. These plants were, when mature, harvested individually and tillers and ears per plant, number of grains per ear, weight of 100 grains and weight of grain and straw per plant recorded. From these observations, gross variability present in different samples was estimated. It is found that there are significant differences among the samples for gross variability. The following ten out of sixteen samples were selected on the basis of their gross variability and high mean values for estimating that portion of the variability which is genetic:-

      Barwani white, Dhar local, Dewas Senior, Jaora local, Jhabua Kathia, Rajgarh Kotra white, Rajgarh Talain white, Ratlam white, Ratlam red and Indore white. Eighteen progenies from each of these ten samples were grown next year on three randomised blocks. All the attributes of yield were recorded on them and the regression of these progeny means on their parental values were calculated, and the results indicate that there is no genetic variability in most samples except in two, from Jhabua and Barwani States. Most of the gross variability is found to be environmental.

      Selection can thus be effective only in Jhabua and Barwani local wheats, while for general improvement, hybridisation of local wheats with outside types would appear necessary.

    • Improvements in colorimetric determinations - Part II. A rapid method for estimation of organic carbon in soils

      K L Khanna S N Prasad P B Bhattacharya

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      1. The paper describes a rapid method for estimation of organic carbon by photo-electric colorimeter which has distinct advantages over Walkley and Black’s wet combustion method. In the procedure followed, the change of colour from Chromate yellow to chromic green in oxidation of organic matter by dichromate and sulphuric acid, has been made use of for colour standardization and estimation of organic carbon in soils.

      2. A simple method suitable as field technique (R.C.M.) has also been evolved on the same principle and tested on a large number of soils of different organic carbon concentration with a fair degree of correspondence with Walkley and Black’s method.

    • Studies on the embryology of Microchiroptera - Part III. The histological changes in the genital organs and accessory reproductive structures during the sex-cycle of the Vespertilionid bat—Scotophilus wroughtoni (Thomas)

      A Gopalakrishna

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    • The action of ions and drugs on the effects of asphyxia on the mechanical response of unstriated muscle

      Sunita Inderjit Singh Inderjit Singh

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      1. There is a glycolytic system in unstriated muscle for acid solutions, as shown by the effect of glucose in improving the response both aerobically and anaerobically.

      2. The glycolytic system for acid solutions is antagonistic to that for alkaline solutions.

      3. Both the ærobic and anaerobic mechanisms for tone and twitch respectively are different both in acid as well as in alkaline solutions.

      4. Potassium postpones or hastens asphyxiai arrest.

      5. Calcium also has similar action.

      6. Tone producing substances act similarly to potassium.

      7. Riboflavine improves the response aerobically as well as anaerobically. Thiamine, ascorbic acid and nicotinic acid have no such action.

      8. Sudden increase of osmotic pressure of the saline relieves asphyxiai arrest.

      9. Glucose has inhibitory effect also in the presence of oxygen.

      10. Fatty acids, such as acetic, propionic and butyric also improve the response in the presence of oxygen.

      11. Inexcitability is of two kinds: one due to changes in the excitatory process, and other due to exhaustion of energy supplies.

    • A method for the determination of cellulose destroying indices of bacteria

      S R Sen Gupta B B L Saxena A N Mukerjee

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      A simple method has been described for determining the cellulose destroying indices of bacteria. The method may be employed in assessing the efficiency of rotproofing agents against bacterial deterioration.

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