68 The Botanical Gazette. [February, 
6. Time of exposure I hour. 
Diffused light. | Ether.....:....... 64 57 7 10.9 
Diffused light. | Normal.......... 57 61 7 12.2 
Dark Ether 68 61 7 10.2 
POs | Normal... .::.... | 48 43 5 10.4 
—— ee 
Conclusion: Ether retards transpiration in both light ani 
dark. 
: V. Summary. 
1. Ether retards protoplasmic action. Given in sufficiet! 
dose it kills protoplasm. 
2. Ether retards transpiration by retarding assimilation. 
3. Anything that retards assimilation will retard transpr 
ration. 
4. Increased loss of water vapor in the anzsthetized ve 
etable tissue is due to the fact that the anesthetic has killed 
the plant tissue, thus allowing evaporation to take place, and 
not transpiration. ) 
5. Ether retards transpiration under all conditions. = 
6. Transpiration is not essentially a chlorophyllian function 
7. Experiments in which the entire plant is not used a 
practically valueless. a 
8. Periods of maximum growth and maximum transpiratiol 
coincide. | 
VI. Bibliography. 
Berthold: Studien tiber Protoplasma-Mechanik, 1886. 
Boehm: Ber. d. deutsch. bot. Ges., heft 9, 1890. . 
Bokorny: Ber. d. deutsch. bot. Ges., heft 1, 1891. i 
Bokorny: Flora, heft 3, 1890. ; 
Detmer: Ber. d. deutsch. bot. Ges., heft 8, 1890. 
Frank: Pflanzenphysiologie, 1890. 
Goodale: Physiological Botany, 1885. - 
Hartig, Theo.: Anatomie und Phys. der Pflanzen, 1878. 
| Hartig, R.: Anatomie und Phys. der Pflanzen, 1891. 
Janse: Flora, heft 4, 1889. 
Jumelle: Rev. Générale de Bot., no. 1, 1889. 
Jumelle: Rev: Générale de Bot., no. 22, 1890. 
Jumelle: Rev. Générale de Bot., no. 31, 1891. 
Kohl: Die Transpiration der Pflanzen, 1886. 
Lommen: Botanical Gazette, no. 1, 1891. 
Palladin: Ber. d. deutsch. bot. Ges., heft 10, 1890- 
Pfeffer: Pflanzenphysiologie, 1881. 88. 
Pringsheim: Lichtwirkung und Chlorophyllfunctiom, 1° 
0 
