118 BOTANICAL GAZETTE [FEBRUARY 
to the leaves above, and does not cause a marked immediate 
decrease in the transpiration. 
13. Experiments in which 5~10 cm. of the stem are killed by 
treatment with picric acid, 95 per cent alcohol, or CuSO,, for 
36-48 hours show that sufficient quantities of water may ascend 
through the poisoned portions to supply the transpiration need for 
a comparatively long period (90 days), and to allow the develop- 
ment of new branches. ~ 
14. Certain poisons (picric acid, chromic acid, and HgCl,) may 
greatly accelerate the amount of water evaporated in poisoned 
plants. Not all poisons act alike in this respect; HgCl, causes 
the greatest amount of increase in water loss. 
UNIVERSITY OF WISCONSIN 
Manptson, WIs. 
LITERATURE CITED 
I. ASKENASY, E., Ueber das Saftsteigen. Verh. Naturh.-Med. Ver. Heidel- 
berg N.F. 5:325-345. 1895. 
2. ———, Beitrige zur Erklirung des Saftsteigen. Verh. Naturh.-Med. 
Ver. Heidelberg N.F. 5:429-448. 1806. 
3- Boru, J., Ursache des Saftsteigens. Ber. Deutsch. Bot. Gesell. 7° 
46-56. 1880. 
, Ueber Ursache der Wasserbewegung in transpirirenden Pflanzen. 
Verh. Zool. -Bot. Gesell. Wien 40:149-159. 1890. 
, Capillaritat und Saftsteigen. Ber. Deutsch. Bot. Gest II: 
heaaze. 1893. 
Crapp, GRACE L., A quantitative study of transpiration. Bor. GAZETTE 
45:254-267. 1908. 
| 7. CzaPex, F., Review of Se a s “Abtétungs und Ringelversuche.” 
Bot. Zeit. 65: 2302-393. 
8. , Die Pe ah ured viislogis der Pflanzen zeit 1896. Progressus 
Rei Botanica I2419-532. 1907. 
9. Drxon, H. H., Note on the supply of water to leaves on a dead branch. 
Sci. Proc. Ray. Dublin Soc. N.S. 1137-12. 5. 
, Vitality-and the transmission of ae through the stems of plants. 
Notes Bot. School Trinity Coll. Dublin 2:5-18. 1909; Sci. Proc. Roy. 
Dublin Soc. N.S. 12: 21-34. 1909. 
1X. ———¢, Note on the Cas strength of water. Sci. Proc. Roy. Dublin 
Soc. N.S, 12:60-65. 
/iciasied lien the the ascent of sap. Progressus Rei Botanicae — 
- 1909. ; 
> 
o 
ere” 
