500 G. H. PARKER 
second at 21° is taken to be 7.7 cm., then at 11° half that, or 
3.85 em., should be expected, which is very close to the observed 
rate of 4.0 em. per second. On this basis at 31°, a rate of twice 
7.7 em., or 15.4 em., per second should be looked for, but as a 
matter of fact the rate at this temperature was found to be 20.7 
em. Aside from this determination, however, all the other rates 
TABLE 5 
Times in seconds for the passage of waves of luminosity over a strip of Renilla 
rachis 9.1 cm. long and subjected to the following temperatures: 21°, 11°, 31°, 
and 21°C. (see figure 12) 
pale s eee 
ais NUMBER OF THE TESTS intial 
Se TIME SECOND 
ia (aol) harm eomeimeee bear |. 8. | go ate 
cm. 
Dil Se cle Deal SOG deol alias NO Mae ib AN OS) Ay re ales (hail 
1S 20 2) 2) | 2530) | 264s eA D2 eale2 ae 2.4.) 2-4) 2a ees 4.0 
31° |0.4;0.4/0.2);04;)06)04)06)04/0.4)06)] 0.44 20.7 
2ST lO LAr ele 2 AS ee le ie ela 2 i eo AO eae 0 7.6 
TABLE 6 
Times in seconds for the passage of waves of luminosity over a strip of Renilla 
rachis 9.3 em. long and subjected to the following temperatures: 15°, 20°, 25°, and 
15°C. (see figure 12) 
e 2 NUMBERS OF THE TESTS - s. 
BP ; AVERAGE | RATE PER 
a TIME SECOND 
5 1 2 3 4 5 6 7 8 el ent 
cm, 
Dy 0) LEG. | 14 Vee 2 ed A 2 ee 1 ea ere 6.5 
20° 11.0) | O18 Wezel 0" 14) 12) 4a eR OFS) ete 8.3 
25° | 0.8 | 0:6 | O289)028 | 0'8 | 1.0 | 0.6 | 0.8) 0:87 0%6)), O276 12.2 
SUBS) VA | 12. eG 12) 1 Geta 28 Ga eo 6.6 
are related in the sense that for every interval of 10° the higher 
rate is approximately twice the lower one. Although the usual 
interpretation of this condition has been more or less questioned 
recently, it is generally assumed, in accordance with the Van’t 
Hoff law, that such relations in rates are indicative of chemical 
rather than of: physical processes, an assumption that would 
aline the kind of transmission that occurs in the wave that con- 
