120 BOTANICAL GAZETTE [aveos 
water. In the great majority of instances where regeneration oot 
however, it cannot be due to any disturbance in the amount of water 
present in the parts concerned. Several leaves of Begonia atl 
Bryophyllum were kept in the air of the room, but with their petiols 
in water. The blades quite plainly were not more turgid than thos 
left on the plants, and not so much so as those on plants grownin 
Moist air; yet they produced buds while the latter did not. 
The results of experiments with the other factors mentioned wil 
be presented i in the second paper of this series. 
THE UNIVERSITY oF CHICAGO. 
LITERATURE CITED. 
I. DiCuavons A. P., Physiologie végétale. 2 vols. Paris. 1832. 
2. GOEBEL, K., User kiinstliche Vergriinung der Sporophylle von Onoda 
Struthiopleris Hoffm. Ber. Deutsch. Bot. Gessells. 5:66-74.' 1887. 
a. » Ueber Regeneration im Pflanzenreich. Biol. Centralbl. 22:38 E 
397, ete. 1902. 
4. , Organography of plants, especially of the archegoniates and spermato 
‘byte Part I. pp. 270. figs. 130. Oxford. 
5- Kress, G., Willkiirliche Entwickelungsinderungen bei Pflanzen. Pp 
6. Kisrer, E., Beobachtungen _iiber Regenerationserscheinunget s 
Pflanzen. Beih. Bot. Centrabl. 14: 316-326. 1903. See also linea 
quoted in this paper. — 
7- Morean, T. H., Regeneration. pp. 316. New York. 1901. 
8. PrErrer, W. » Physiology of plants. Oxford. Vol. II. p. 167. 
9. Prantt, K., Untersuchungen iiber die Regenerationen des Vegetalo®’ 
punktes an Angiospermenwurzeln. Arbeit. Bot. Inst. Wiirzburg 1: 
etc. 1874, 
sree J., Physiologische Untersuchungen iiber der Keimung der: 
€. Gesam. Abhandl. Pflanzen-Physiologie Abh. 25:574-__ 
Sites S., Untersuchungen iiber die Regenerationen der W 
iss. Bot. 40: 103-143. 1904. 1 
Vocutine, H., Ueber die Regeneration der Marchantieen. Ja. 
Bot. 16: hs acd: 1885. 
T3. , ees Organbildung im Pflanzenreich. Bd. I. Bonn. 7 
14. » J. H., Onderzoekingen over adventiene Knoppen- “ 
1885. 
Lal 
Lon 
. 
i fects. iaserdank 4 
15. WIESNER, J., Der absteigende Wasserstrom und dessen phys 
Bedeutung, Bot. Zeit. 47: I-9, etc. 1889 
