Volume 49, Issue 2
February 1959, pages 87-147
pp 87-93 February 1959
The respiratory system ofDorylus labiatus Shuck. (♂) is described and illustrated. The classification of spiracles based on the shape of the muscles is confirmed by these findings. The results are compared with those of other Hymenoptera. It is doubtless that there exists a close relationship between the development of number and/or size of air-sacs and the size of the body or its parts. So far as adult Hymenoptera are concerned it appears that external appearance influences the development of internal tracheal system.
pp 94-98 February 1959
1. In this paper information regarding the various spore-forms ofGanoderma lucidum has been presented.
2. It has been found that besides the normal basidiospores, two other spore types also occur in the fructifications of the fungus collected from Nature or produced in artificial culture. These are ‘secondary spores’ and ‘gasterospores’.
3. Characteristic features of all the spore types have been fully described and their modes of origin noted.
4. All the three types of spores are more or less identical to each other in appearance. But the secondary spores have endospores less verrucose than the endospores of the other two types, whereas the gasterospores are characterised by two opposite notches in their exospores.
pp 99-107 February 1959
pp 108-114 February 1959
1. The distribution of protein-bound amino acids, during the development ofOryzias melastigma, has been made qualitatively by paper chromatographic technique.
2. The protein-bound amino acids show six different patterns of distribution during the development of the embryo.
pp 115-123 February 1959
pp 124-128 February 1959
pp 129-135 February 1959
1. Frog’s stomach muscle when immersed in eserinised Ringer’s solution for 2 hours shows no leakage of acetylcholine, whether extended or unextended.
2. Electrical stimulation of the muscle or its nerves does not release any acetylcholine.
3. Depolarisation with strong solutions of potassium chloride does not liberate acetylcholine.
4. Immersion in strong solutions of calcium chloride does not liberate acetylcholine.
5. Heating to 50–60° C., or treatment with ether liberates acetylcholine; the muscle also relaxes actively if heated. Adrenaline or noradrenaline is also liberated by heating.
6. As heating to 50–60° C. causes active relaxation as well as liberation of acetylcholine, it is suggested that acetylcholine is in some way connected with contractility by direct action on the contractile mechanism.
7. The above results were obtained in autumn, but in winter acetylecholine was liberated.
pp 136-138 February 1959
pp 139-147 February 1959
1.Apanteles angaleti Muesebeck is a solitary endoparasite of thePink bollworm,Platyedra gossypiella Saunders in India.
2. The host selection of the parasite has been studied in detail. The females prefer 4 to 8 days old larvæ for oviposition and the maximum eggs are deposited in 6 days old larvæ.
3. Various factors which stimulate oviposition in parasites in general and particularly in the case ofApanteles angaleti have been discussed. In this case the host selection is based primarily on physical characters of the host larvæ such as rigidity of integument. Stimulus for oviposition is the sense of touch and not that of smell.