THE 
AMERICAN NATURALIST 
M 
2. -| Jee 
Vout. XXIX. July, 1895. 343 
THE SYMBIOSIS OF STOCK AND GRAFT. 
By Erwin F. SMITH. 
Under the title, Ueber Transplantation am Pflanzenkérper, 
(pp. VI, 162, Pl. XI, figs. 14), Dr. Hermann Vochting, Prof. 
of botany in the University of Tübingen, has contributed a 
study on the relations of graft and stock which is of unusual 
interest. After some consideration of the literature of the sub- 
ject he discusses (1) Methods of grafting, (a) Grafting of like 
parts in normal and abnormal positions; (b) Grafting of un- 
like parts; (2) The symbiosis of scion and stock ; (8) Histo- 
logical investigations. The author’s conclusions relative to 
the mutual relations of stock and graft rest upon careful ex- 
periments covering a period of some years. His first exper- 
iments consisted in the union of parts of the same and related 
varieties of the red beet. The top of a plant recently grown 
from the seed but sufficiently large was cut away and young 
shoots from two-year old blossoming plants were grafted on. 
These cions were taken from the base of recently developed 
shoots and bore from two to three vegetative buds. These 
buds grew into short, fleshy sprouts plentifully provided with 
leaves which resembled those of the first year, i. e. were not like 
those on the blossom shoot from which they weretaken. Sub- 
sequently the axis also became thickened but to a less degree. 
The shoots did not produce blossoms but elaborated food for 
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