PLANT RESPONSE 67 
compared with responses given at the same temperatures 
while warming (see table). Temperature variation thus 
seems to have a stimulating effect on response, by 
increasing molecular mobility in some way. The second 

Fic. 40.—Rercorps or Responses IN EucuHaris Liny purinac Rise Anp 
Faun or TEMPERATURE 
Stimulus constant, applied at intervals of one minute. The temperature of 
plant-chamber gradually rose on starting current in the heating coil; on 
breaking current, the temperature fell gradually. Temperature correspond- 
K S Miho 5 : E i 
ing to each record is given below. 
Temperature rising: (1) 20°, (2) 20°, (8) 22°, (4) 38°, (5) 53°, (6) 68°, (7) 65°. 
Temperature falling : (8) 60°, (9) 51°, (10) 45°, (11) 40°, (12) 38°. 
record (fig. 40) shows the variation of response in 
Kucharis lily (1) during the rise, and (2) during the fall 
TABLE SHOWING THE VARIATION OF RESPONSE IN ScorcH KALE 
DURING THE Rise AND FALL oF TEMPERATURE 
Temperature Response Response 
[Temperature rising] [Temperature falling] 
NOSO Rte |e eo Ad dns, 
ee ere ode eis lieve, ee oes 
NO spite oo. | cw yell Sock Vela lpr teh CONC S CAA 
1510) nay ee ee : Si. wlGy 
AU e arcs” hes oe — 
