Volume 21, Issue 5
May 1945, pages 259-278
pp 259-265 May 1945
Frogs were encountered, the stomachs and hearts of which were refractory to the action of acetylcholine, even after eserine. In the hearts, the beats were augmented by acetylcholine, but diminished by vagus stimulation. They could be tetanised, and the responses with electrical stimulation were graded. The aurides and ventricles beat rhythmically but independently in the absence of electrolytes.
pp 266-268 May 1945
Colchicine induced autotetraploid progenies belonging to two different years were compared with their diploid progenitor for various characters. Most of the characters of the autotetraploid exhibit a decrease over that of the diploid except in the case of petal size and pod breadth which have increased slightly. The unfavourable effect is rather drastic particularly in respect of characters affecting the yield of the plant.
Since very similar results have been obtained inrahar (Cajanus indicus Spreng), it is suggested that colchicine induced autotetraploidy may not prove to be a suitable method for improving the various pulse crops.
pp 269-278 May 1945
The anther shows a wall with only three layers; the tapetum becomes binucleate; pollen grains are tri-nucleate at shedding stage.
The ovary has innumerable anatropous ovules attached on a massive central placenta. Megasporogenesis proceeds normally and the embryo sac is formed according to the normal type.
The embryo is formed according to heCapsella-type.
Endosperm isab initio cellular, and is formed according to thePhyteuma-type described by Rosen.
A slight departure from the above type is met with in a large propertion of ovules, and since this is also quite a distinctive one, it may be regarded as a type, theIsotoma-type.
A reference to the systematic position of the genusIsotoma is made in the paper.