1893.]  Lnfluence of Anesthetics on Plant Transpiration. 69 
Sachs: Physiology of Plants, 1887. 
Schimper: Bull. Tor. Bot. Club, no. 7, 1891. 
Stich: Flora, heft 1, 1891. 
_Strasburger: Bau und Verricht. d. Leitungsbahnen, 1891. 
Vines: Physiology of Plants, 1886. 
Volkens: Ber. d. deutsch. bot. Ges., heft 4, 1890. 
Wiesner: Ann. des Sciences Nat., 1876. 
Wiesner: Ber. d. deutsch. bot. eR heft 2, 1891. 
University of Minnesota. 
EXPLANATION OF PLATE VI. 
a, stand made of ioe seasoned heavy oak. All the bine work is thoroughly 
si 
ed in hot paraffine to make it impervious to w 
6, a glass ye filled with water in which is placed ee rool of the plant experi- 
mente on. 
¢, block of fear o hold ¢ in its place. 
d, rubber stopper fitting into 4, with two openings, one for bent A apg tube con- 
ne h 
colu 
a capillary tube connected with f and from which the observations are 
i, Pa gla ass plate with ground surface. 
8 
J, lass tube pass ing t rough opening in 7 and wood work, connected he z. 
» Tubber stopper in upper end of 4, perforated to admit stem of plant experi- 
ented upon. An incision is made from surface to central fares to 
admit plant 
> bell a 
¢ temperature os Semonpere 3 in &. 
to atte ee to atmos 
gat ube connected with o and an ee hand- or foot-bellow 
=" rate containing water to be taken up by 4 when no observations are 
5, m 
— scale on which to cael the rate of movement of water column in 4 
gol 
ek metronome regulated to beat scconds to assist in making 
u, demas: to reer block ¢ fi 
tmly in place. 
a peer: rubber tube to connect Sf wit hh. 
perfora ect toppers old a small thermometer in place. Above upper 
di S50 tc., Ss — be placed a 2 little cotton to act asa fitter to prevent sand, 
re xpansion is comparativel ae Bubbles of howev mati 
are very susce: usceptible to chan = : es gas, ever $s 
by of tem t 
the fluctuations f the am e tg a and make their presence kno 
