32 RESPONSE IN.THE LIVING AND NON-LIVING 
I. LEeA¥F-sTALK OF PLANE-TREE 
The stimulus applied was a single vibration of 90°. 


A. After 24 hours in water , B. After 24 hours in ; C. After 24 hours in mer- 
chloroform-water | curic chloride 
[All leaves standing up | [Leaves began to [Leaves began to droop 
and fresh — aphides droopinlhourand in 4 hours. Deep dis- 
alive | bentoverin3hours —_ colouration along the 
—aphides dead | veins. Aphides dead} 
Electric response | Electric response Electric response 
(Lyaf:5 2isdns: | (iris. hd: (Q):428 QO — dn. 
(2) ole, (PD Baker Ihe op (2i)eeeees 7) 5 a 
(ayia. 26, (Ga perce i (Syn ob x, 
(Ayn s.-: 1s G, (Ace) Onn (4) peeps 0 ss 
(5) ie (BD) eee: | gears CO) eeeree 25 5 
(G)i.5 2 D3 vans (G)i teed Debs. (B) zee 25 ,, 
(ysiee 30) -55 (i) sectese Di es (2) ee 0 Fs 
(8) sas: De, (S)genase BE ses (8) n.8 po ae 
(Ore en PASE ny, (652) eae! om Aer (9) xe 26 5, 
€10).....: ir, (AD) 5. nae 5, (10) 292 be 
Mean response 23°6 Mean 1 Mean ‘15 
II. LEAF-STALK OF HoRSE-CHESTNUT 

ietew te 15 dns. Glas ‘5 dn (AD sea O dn 
) ea Laer | (2) Sass (2) ee Ona 
Nacielac 10. «;, | (a) eereee Onme | (8): csasaleae 
——— —_—— — — ———— ————_—_—_—___—_—— = 4 — 
Mean 14 Mean °3 | Mean O 
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- 
eressive 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 
