Response in the living and non-living / by Jagadis Chunder Bose.

  • Jagadish Chandra Bose
Date:
1902
Catalogue details

Licence: Public Domain Mark

Credit: Response in the living and non-living / by Jagadis Chunder Bose. Source: Wellcome Collection.

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    I. Leaf-stalk of Plane-tree The stimulus applied was a single vibration of 90°. A. After 24 hours in water [All leaves standing up and fresh —- aphides alive] Electric response (1).. ...21 dns. (2).. ....31 (3).. ....26 77 (4).. ....15 77 (5).. ...17 77 (6).. ....23 77 (7).. ....30 77 (8).. ....27 77 (9).. ....29 77 (10).. ....17 7? Mean response 23’6 B. After 24 hours in chloroform-water [Leaves began to droop in 1 hour and bent over in 3 hours —aphides dead] Electric response (1)- ...1 c- dn. 12)... ...1 >> (3)... ...2 77 (4)... ...0 77 (5)... ...1 77 (6)... ...1-5 77 (7)... ...2 77 (8)... ...1 77 (9)... ...1 77 (10)... .. ’5 77 Mean 1 C. After 24 hours in mer¬ curic chloride [Leaves began to droop in 4 hours. Deep dis¬ colouration along the veins. Aphides dead] Electric response (1)- .0 dn. (2). . -25 77 (3). . -25 77 (4). .0 77 (5). . *25 77 (6). . *25 77 (7). .0 77 (8). . *25 77 (9). . -25 77 (10). . • 5 77 Mean T5 II. Leaf-stalk of Horse-chestnut (1).15 dns. (1). ‘5 dn. (1) .0 dn (2).17 „ (2). -5 „ (2) .o „ (3).10 „ (3).0 „ (3) .o „ Mean 14 Mean ’3 Mean 0 These results conclusively prove the physiological nature of the response. I shall in a succeeding chapter give a continuous series of response-curves showing how, owing to pro¬ gressive death from the action of poison, the responses undergo steady diminution till they are completely abolished. Effect of high temperature.—It is well known that plants are killed when subjected to high temperatures. I took a stalk, and, using the block method, with torsional
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