Volume 14, Issue 2
August 1941, pages 75-200
pp 75-94 August 1941
pp 95-113 August 1941
pp 114-136 August 1941
The histology of the pericarp of wild and cultivated races of sorghum have been described.
The organogeny of the pericarp has been studied. The tube cells were found to arise from the inner epidermis of the pericarp while the integument was from the inner integument and not from the nucellus. The latter is completely absorbed.
The wild sorghums are characterised by a very thin pericarp consisting of only epidermis and tube cells and sometimes a very small tissue of mesocarp. An integument is always present. All wild sorghums are brown coloured.
The cultivated sorghums have similar layers to the wild ones but the number of layers is greater. The grains could be distinguished into two main groups (i) starchy and (2) non-starchy. The integument is found only in some grains and absent in all others. The grains with the integument are generally brown.
The colour of the pericarp is found mostly in the epidermis, hypodermis and the tube cells. The integument is always coloured brown and the tube cell is also coloured similarly whenever an integument is present. The mesocarp is rarely coloured.
An examination of the F1 and parents of some of the crosses revealed that while both the parents had no integuments at all, the F1 had an integument indicating complementary factors.
On examination of pseudomutation grains and grain chimera it was seen that whenever there was a brown colour there was an integument present and absent when the grain was not brown.
pp 137-140 August 1941
pp 141-148 August 1941
The nutrient solution used containing mineral salts and pure dextrose does not contain any appreciable amount of growth-promoting substances.
Pythium arrhenomanes, P. deliense, P. graminicolum, P. hyphalosticton andP. mamillatum are capable of unlimited growth in the nutrient solution.
The results of the experiments show that the organisms are capable of synthesising their own growth-promoting substance from the elementary ingredients of the nutrient solution.
Some of the growth-promoting substance manufactured by the organisms is also given off by the mycelium into the solution.
The addition of thiamin to nutrient medium B has no marked effect on the growth of these organisms.
The failure ofPythium arrhenomanes andP. hyphalosticton to grow in the synthetic liquid medium used by Robbins and Kavanagh is found to be due to the concentration of the medium. It is suggested that the concentration hinders the synthesis of growth-promoting substance and thus affects the growth.
pp 149-165 August 1941
The haploid and diploid chromosome numbers ofAsteracantha longifolia Nees., are 16 and 32 respectively.
The floral parts develop in the order calyx, andrœcium, corolla, and gynœcium. The anatomy of the stem, root and leaf and the morphology of the thorns have been described.
The development of the micro- and megaspores is traced. In the embryo development suspensor haustorium and micropylar endosperm haustorium have been observed. The endosperm is cellular and the micropylar haustorium is bi-nucleate.
The morphology of the jaculator is described.
In regard to the position of the genus in the family correlation between Hobein’s classification on the basis of cystolith features and the chromosome numbers is suggested.
pp 166-187 August 1941
A detailed study has been made of the vascular supply of the ovary of about a dozen of species belonging to eight different genera.
The tetra-carpellary theory of the Crucifer gynæceum, as proposed by Eames and Wilson, has been supported and placed on firmer grounds.
A conception, different from the one given by Eames and Wilson, is suggested for the solidification of the carpels and the extrusion of the ovules. The fusion of the margins of the fertile carpels is believed to have taken place only after the ovules had been extruded from the loculus into the cavity enclosed by the sterile carpels.
The septum is believed to be mainly receptacular in the basal region and placental in the upper.
pp 188-200 August 1941
The result of the study of vital capacity of 166 Mysore medical students is recorded.
The average vital capacity of Mysore students is calculated to be 3·190 ± 0·379 litres, 19·1 c.c. per cm. of height and 2·05 ± 0·0174 litres per sq. metre of surface area of the body. The correlation between vital capacity and height is found to be slightly higher than that between vital capacity and surface area. Low weight of the individuals is suggested as a possible factor to account for such a correlation.
The average vital capacity and vital capacity values per cm. of height and per sq. metre of surface area are all decidedly lower than those of Americans.
The factors that contribute to reduce the vital capacity of people living in tropics are considered.