PAPERS ON BIOLOGY AND AGRICULTURE 



197 



Leaf Time B. crenatum 



20 da. 2 basal shoots in each. 

 2 apical in 4, 1 apical 

 in 1. 

 4 wk. Some notch growth. 

 11 5 da. 2 apical node shoots in 

 each. 1 basal in one. 



20 da. 2 basal in one and some 



notch growth in 2 

 leaves. 

 14 14 da. Opposite axillary shoot, 

 slight notch growth in 

 most leaves, petiole 

 intact. 

 4 wk. Adjacent shoot in one. 



20 5 da. Adjacent buds in 3 out 

 of 6. Notch growth in 

 others. 



21 da. Adjacent shoots in all, 



slight notch growth in 

 4. 



23 12 da. 2 shoots from each apical 

 node. 2 from second 

 node in two cases. 

 20 da. 2 shoots from 3rd node 

 in 1. 

 28 3 da. Buds in all 5 cases. 



12 da. 2 shoots from each node. 

 38 7 da. 3 out of 5 had both axil- 

 lary buds, 2 had ad- 

 jacent bud growing. 

 9 da. 4 — both axillary shoots, 

 1 — opposite shoot. No 

 notch growth in 4 with 

 both buds. 

 1 7 da. Most notches had growth. 

 (In 5 wk. Shoots about 1 inch long 

 dark) but not sturdy. 



In all notch growth, 

 shoots developed first, 

 then roots. 



Time B. calycinum 



17 da. Notch roots under water. 



A few 2 apical shoots in each. 



days. 

 17 da. No notch growth. 



A few notch roots and 

 shoots. 



10 wk. Petiole fallen off, axil- 

 lary shoot growing. 

 6 wk. Adjacent axillary shoots 



14 da. In very young plants — a 

 few roots on base of 

 stem, and in 6 wks. 

 much notch growth 

 under water. No ad- 

 jacent buds. 



(Author's results) 

 Apical node shoots only 



No growth. 



Opposite shoot, no notch 

 growth. 



No growth. 



Many small roots. 



Shoot from base of pet- 

 iole. (Author's result) 



Roots develop first, then 

 shoots, when leaves arc 

 separated from plant. 



BIBLIOGRAPHY. 



1. Loeb, J.: Rules and Mechanism of Inhibition and Correlation in 



Bryophyllum Calycinum. (Bot. Gaz., 60:249-276, 1915.) 



2. Loeb, J.: Morphological Polarity in Regeneration, I. (Journ. 



Gen. Physiol., 1:337-362, 1919.) 



3. Goebel, K.: Ueber Regeneration in Pflanzenreich. (Biologisches 



Centralblatt, 22:396, 397. 1902.) 



4. Child, C. M. and Bellamy, A. W.: Physiological Isolation by Low 



Temperature in Bryophyllum. (Bot. Gaz., 70:249-267, 1920.) 



