• Volume 11, Issue 2

      February 1940,   pages  61-116

    • Some studies on the metabolism and growth of malta oranges

      Jai Chand Luthra Indar Singh Chima

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      1. The respiratory activity, relative growth rate, nitrogen content and the march of carbohydrates and acidity have been studied throught its development from adolescence to maturity.

      2. A curve characteristie of the respiration of fruits has been obtained and the results are in accord with the findings of Kidd, Wardlaw and Leonard and B. N. Singh. The respiration intensity is very high during the adolescent stage and falls off rapidly, prior to second maximum which marks the onset of colour changes in the fruit during maturation.

      3. The growth rate and nitrogen content are highest during the earlier stages and decline continuously towards the end.

      4. The respiratory activity, growth rate and the nitrogen values run parallel to each other and statistical studies exhibit a very high and positive correlation between them.

      5. Reducing sugars, sucrose and total sugars steadily accumulate from adolescence to maturity. The reducing sugars however show a decline towards the end and are highest just before the onset of climacteric rise in respiration.

      6. The total titrable acids gradually increase till 170th day, but fall down later on.

      7. The total solids are highest in the beginning when the fruit is young but later on decrease on account of the progressive hydration which follows subsequently.

    • The venous system of the pond-turtle,Lissemys punctata (Bonnaterre)

      Prahlad Narain Mathur

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      The author gives a detailed description of the venous system ofLissemys punctata. The more important features discovered are as follows:—

      1. The precaval vein, on each side, is composed of two tributaries— the subclavian vein and the jugular vein; butthe left jugular is a remarkably slender vessel.

      2. There are three longitudinal veins in the neck of which the middle one is the right jugular. These veins are connected to each other by anastomoses.

      3. There is avenous sinus at the back of the head into which the cephalic veins open. A detailed description of the veins of the head is given.

      4. Each kidney receives its venous blood by means of three important veins—Vena renalis advehens anterior, Vena renalis advehens externa, andVena renalis advehens posterior. All these veins are described in detail.

      5. An account of the renal portal system is given. The presence of a pubic sinus and the relation of theposterior renal advehent vein to it are new features discovered.

      6. The posterior vena cava is inclined towards the left side—a fact of phylogenetic importance. The posterior vena cava is also continued behind the kidneys.

      7. The venous supply of the liver and the shell is described in detail.

    • A contribution to the embryology ofEnalus acoroides (L.fil.), Steud.

      S B Kausik

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    • An embryological study ofSuriana maritima Linn.

      M Anantaswamy Rau

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      The ovule possesses a single integument. The megaspore-mother cell is deep-seated on account of the development of the parietal tissue. A linear tetrad of megaspores is produced and the lowermost megaspore produces the embryo-sac.

      The development of the embryo-sac is normal. The fully formed embryo-sac has a broad micropylar end and a narrow chalazal end. The antipodals degenerate early. The nucellar cells around the antipodal end of the embryo-sac are seen to possess a dark staining substance.

      The antipodal end of the embryo-sac grows considerably in length during the post-fertilisation stages and forms a long tubular structure. The ovule undergoes a curvature and becomes campylotropous in later stages, enclosing the curved embryo.

      A well-defined hypostase is present in the ovule.

      The pollen grain at the time of shedding is two-nucleate.

    • Embryological studies of some members of Rhamnaceæ

      D Srinivasachar

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