60 
BOTANICAL GAZETTE [JANUARY 
though some plugging of the lumina occurs. I have tabulated 
(table VII) the results obtained by this method for comparison with 
those obtained in experiments with steam. 
t10° C. AS COMPARED. WITH 
TABLE VII 
SHOWING RESULTS OF KILLING CERTAIN PORTIONS OF THE STEMS WITH WAX HEATED: 
UNHEATED STEMS CUT AND SET IN WATER 
No. of exp. 
va Length of 
| por See 
Date 
Results and remarks 
I—W 
(1910) 
Ty 
2—W 60 cm. 
(1910) 
3—W 50 cm. 
(1910) 
Ww. 53 cm. 
(1910) 
5s—wW - 50 cm. 
(1910) 
W 30 cm. 
(1910) 
7—W 40 cm. 
(1910) 
Ww 34 cm. 
(1910) 
| 65 cm, 
| 
6 cm. 
I2 cm. 
Io cm, 
ro cm. 
40 cm. 
20 cm, 
Io cm, 
5 cm. 
May 7 
May 7 
May 19 
May 19 
May 19 
May 22 
May 22 
May 22 
Leaves began to wither May 23, i. 16 
pads, control in water dry 
relaxed about stem, ence it to 
May 23, eaves slightly drooped but per- 
fectly turgid; May 25, leaves quite 
i doh an 
May 26, leaves drying and inrolled; 
aa after 19 days, cut sth 28 examina- 
ontrol same as in n ' 
June tr, eaves drooping; tiie slightly in- 
withering June 16; involucre 
Sea fine a dave control ri water 
dried oe ony ee 
Leaf tips drying and -— slightly : 
portio ve 
yellow streaks about bundles, but no 
apie of the lumina; control same as 
Songs 20, a leaf tips drooping; May 23; : 
leaves beginning to dry; May 25, plant 
abe cap 5 days only; cut off — = and 
sin, color rose in vesse Y5 
st visible plugging. of faeatiin’ conti 
same as in 
June 2, le eaves Sete to dry; Jun 
nnin, 
eowing: color; June 18, 
j June he plant eu uite — 
m 
wilting; control dry in S days. 
Experiments in which steam was employed to kill certain 
stretches of the stem, as indicated in table IV, show that the leaves 
