STUDIES IN PLANT REGENERATION 298 
longitudinal, tangential, and transverse cuts from the under surface, 
have failed to call forth any regeneration.* 
Wakker 1 divides leaves which regenerate into those in which 
buds are normally present in the life of the leaf, and those in 
which they are absent. He says that if the buds are removed 
Fic. 11. Shoot of Sedum tortuosum showing a bud at a transverse cut ша leaf. 
from the leaves of the former type — of which Bryophyllum is the 
best known example, they cannot be replaced. The results of an 
operation of this sort on Leptaxis (Tolmiea) Menziesii show that this 
is not universally true. 
Experiment 43. 
junction of the blade and petiole of these leaves were removed with 
a very sharp small scalpel from twelve specimens, so that no 
visible trace of these remained. Then the leaves were placed in 
the sand. They rooted plentifully both from the preformed rudi- 
ments at the back of the petiole, near its insertion, and from new 
* Ап interesting fact (which i is well Laban in КРЕ ер аас) M was illustrated by 
Though it had been readily propagated from stem and leaf cuttings, an 
hi 
зон ит, the plant had never 
had been placed gag under the name of Sedum aure к 
Іп the regeneration experiments, practically every leaf was 
een known to 
as a result a flower stalk appeared, and the probable 
wounded in one way or another ; 
identity of the oe was discovered. 
, J. H. Onderzoekingen over adventieve Knoppen. 
1887. 
(Reviewed in 
T Wakke 
Dot. бше. ei: 238. 
