Volume 9, Issue 5
May 1939, pages 229-322
pp 229-235 May 1939
pp 236-246 May 1939
pp 247-255 May 1939
Root development of representative types oftoria, sarson, raya orrai andtaramira have been studied at two stages of their growth.
The various types under study have been placed in the following classes as regards their habit of root growth:
Root-system having limited depth but extensive lateral spread.
Root-system having extensive depth but limited lateral spread.
Root-system having extensive depth and extensive lateral spread.
Suitability of different types of root-system to different conditions has been discussed and it has been shown that:
Toria is essentially suited for irrigated tracts.
Brownsarson andtaramira are best suited forbarani (rain-fed) areas.
Types of yellowsarson nadraya under study are considered likely to succeed under both irrigated and unirrigated conditions.
pp 256-266 May 1939
The origin, structure and degeneration of the external gills ofA. viridipunctatus have been studied.
They are two simple partially united structures having a median position at the base of the hyoidean arch.
They develop during the late embryonic period and remain functional till the time of hatching.
The ventral aorta is continued into the fused basal portion and the free portions are formed by the two vascular loops of the hyoidean arteries.
Attachment of the fused basal portion of the gills extends from the proximal portion of the ceratohyal on one side to that on the opposite side.
Between the blood-vessels and the outer ectoderm is a thin layer of mesenchyme.
The animal is able to flick gently the organs when they are well developed.
When the larva hatches out the gills shrink in size due to cessation of blood supply and their atrophy is completed by the third day.
pp 267-270 May 1939
Smuts cause heavy losses to grain crops in India but before effective methods of controlling them can be devised their mode of transmission should be clearly understood. Where a smut is definitely known to be seed transmissible, methods of treating the seed have been devised but many of these methods involve a certain amount of cost and also danger. The development of disease resistant varieties helps in such cases to solve the problem.
Investigations have been started in the Imperial Agricultural Research Institute at Delhi to test the relative resistance of strains of wheat, oats and barley to their respective smuts and encouraging results have been obtained which will be published in a series of papers, of which this forms the introduction.
pp 271-286 May 1939
The Golgi apparatus and mitochondria were studied in acinar, duct and islet cells of the pancreas. It is shown that there is no ‘Golgi zone’ and that the secretion granules arise in relation with the Golgi apparatus. The view of Duthie that the prozymogen granules arise in relation with the mitochondria is discussed.
What appears to be the chromophobic components of the Golgi apparatus and mitochondria are demonstrated in acinar, duct and islet cells. It is suggested that what are described by earlier workers as “Ergastoplasm” and “Solger’s filaments ” are after all in many cases the idiosome and the chromophobic component of the mitochondria. The presence of such structures in all types of cells in the pancreas where they have different shapes and which are superimposable on pictures of the Golgi apparatus obtained in the same cells suggests that the descriptions of many of the earlier workers are correct and that these are not artifacts. The suggestion of Subramaniam and Gopala Aiyar that the idiosome may form a core to the Golgi apparatus is substantiated.
pp 287-315 May 1939
pp 316-322 May 1939
The case of caudal abnormality described here is the first of its type and differs from all the previous records of such abnormalities in lizards-A complete account of its external appearance, scalation and skeleton is given, as well as some observations made on the musculature of the regenerated region. The author tries to interpret, as far as possible, how the growing tail must have been injured to produce such a peculiar abnormality. The cartiliginous tube is of a sinuous type and is peculiarly disposed, giving off a very small branch on the right side about the middle of its length.