• Volume 30, Issue 3

      September 1949,   pages  121-184

    • The larval stages ofPericlimenes (Periclimenes) indicus Kemp

      M Krishna Menon

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    • A study of cotton grown under constant soil moistures - Part I. Plant growth and transpiration along with meteorological factors

      P S Sreenivasan

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      1. The water requirement and the performance of a variety in each of American and Asiatic cotton were studied.

      2. A critical study of the rate of elongation was made.

      3. In American the final height, maximum number of leaves and size of leaves increased with increase in soil moisture. But the leaf thickness decreased with the increase in soil moisture (Tables I and II).

      4. In Asiatic variety number of leaves and leaf thickness were maximum in. 24% soil moisture (Table II).

      5. In both varieties the number of bolls and yield of kapas were maximum in plants grown under 24% soil moisture (Table IV).

      6. Transpiration increased with increase in soil moisture in American while in Asiatic variety the transpiration was maximum at 24% moisture.

      7. The factors governing the transpiration were discussed. The main factors which influence the transpiration were found to be the number of leaves and the evaporating power of the atmosphere (Tables VII and VIII).

      8. The transpiration was highly significantly related to number of leaves and evaporation and the multiple correlation ‘R’ was found to be of the order of 0·9.

    • Studies on the anatomy of the tail in Sauria and Rhynchocephalia - Part III.Varanus monitor (Linné)

      Syed Muzammil Ali

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      The undulating type, exemplified byVaranus monitor, was studied both morphologically and experimentally. It shows the following adaptations the vigorous side-to-side movements:

      1. The tail, although thick and rather dorso-ventrally depressed at base, presents a lateral compression along the greater part of its length.

      2. The epithelium, which is leathery in consistency, is devoid of lines of cleavage and is closely attached to the underlying musculature.

      3. For every two rows of ventrals, there are three rows of laterals— an arrangement which provides for stretching.

      4. The vertebræ are strongly built to withstand the stress and strain of lashing, and are characterized by the laterally-elongated centra and the relatively small size of the zygapophyses and transverse processes. Near end of the tail the neural spines and other processes atrophy.

      5. The caudal musculature, except in the anterior part of the tail, consist of five pairs of muscle trunks which run longitudinally up to the end of the tail, two being dorsal to the mesaxonic septum and three ventral to The longissimus ends before it reaches the middle of the tail and the ilio-costal extends backwards from the trunk right up to the end of the tail. There is no such system of tendons as inChameleon.

    • The effect of asphyxia on the response of unstriated muscle to ions and drugs

      Inderjit Singh Sunita Inderjit Singh

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      1. Asphyxia at first increases the responses to potassium and acetyl-choline, then depresses them.

      2. The decline of excitability is affected by the nature of tone.

      3. The resistance to asphyxia of various responses varies in the following order: Nervous stimulation < electrical stimulation < acetylcholine < potassium.

      4. Tone-producing substances depress the response of asphyxiated frog’s unstriated muscle, if the latter is stimulated about once in 10–15 minutes. In mammalian muscle the result is opposite.

      5. Glucose has at first an inhibitory and then a stimulatory action on the response of unstriated muscle to potassium; if the metabolism is increased by raising the temperature, then, the effect becomes stimulatory the outset.

      6. Iodoacetic acid increases the response to potassium after a preliminary depressant effect.

      7. pH 6 increases the response to acetylcholine and potassium after a preliminary depressant effect.

    • Studies in contact toxicity - Part II. Reactivation of surface treated with dichloro diphenyl trichloroethane (DDT) by storage in a Burma teak box

      S K Ranganathan M A Aziz T Kosi V Sankaran

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      Experiments are described which show that, glass surfaces treated with DDT exhibiting feeble activity againstCiliex fatigans Wied can be reactivated as a result of their storage in a box made of Burma teak. The reactivation appears to be specifie for Burma teak, and results obtained with other timbers are described. Some experiments have been carried to elucidate the mechanism of reactivation. Further work is in progress.

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