272 BOTANICAL GAZETTE 
TABLE VI. 
LATENT PERIOD FOR RAPHANUS SATIVUS, 
=] ‘ by Is q e 
$41 [ee ee 
‘ = a 2 4 | ; £ ig ba He 
Flow per minute 5 Be 22 Pa 3 g f 3 f : rE . 
Me a 3 = i 3 ae 
Ea Es as 2 | xe 2 2 2 a1 is aS 
et ma aa a | i: Bie as + 0 noe Dice ac i 
see i : ° oc} ete 
a ogy Ps | ; ole| e| 6] =. HoH at 
ee Shee hy fey Sty ty th th 
285-400 © ...., ; 3 ‘2 ou 7 batt att gt a tye? Bir: : 
2 12 ; be 
de ce Ee Pa i aes sti} ott oti} seit atte SHH [? + 
775-1500... 23. | 20 ° ° ° ° ° ° sth oF 4 ee 
Thag-ag00 = — kk 23 5 ° ° fe} ° ° ° ° ° ; ; : 
The following table shows the shortest latent period observed aS 
for several seedlings. It is certain that the latent period would 
not be shorter in a velocity either less or greater than that given” 2 
for each plant, with the exception of that for Brassica alba. For 
this plant, experiment has not shown whether a quicker response . 
would be found in a velocity greater than 250 - wages 
TABLE VII. 
_ SHOWING SHORTEST LATENT PERIOD OBSERVED FOR SEVERAL PLANTS. 
i Latent period 
fees | Sse 
acme ace Nn Oe Otel OOS EES 
_ Raphanus sativus 23° 200-400" 
Brassica alba 274° 23 200-250 : 
H 1 gare 28.7 23 100-225 : 
Avena sati ee 23 100-225 & 
Zea mays eee) 33 24 200-400 — 
Pisum sativum 25 23 200: 600 : 
Sibaaton ani annuus 415 23 all a 
Vicia faba 6.6 25 225-675 
Lathyrus odoratus responds so slowly that in a set of | 
seedlings in a favorable velocity of water, at a temp 
20° to 23°, 24 hours elapsed before I was certain that t 
were responding ; yet within the next 24 Lo 
showed good rheotropic curves. - 
“These temperatures are taken from the tables in Sachs’ 
a ‘translated by Vines, 1882, p. pon but are — in two cases 
—— in my own w: 
