288 The Botanical Gazette. 
have met the cambium of the scion while the cambium of 
stock met the parenchyma of the primary cortex in the 
The union here was easily accomplished through deve 
ment of meristematic tissue. The section showed the 
parenchyma to have been more active in forming aw 
than was the primary cortex. 
In one case where a potato scion had been grafted to 
mato stock the central parenchyma of the tomato stock ‘ 
bound against soft bast cells of the fibrovascular bundle 
The bast cells had swollen as if attempting to enlarge, th 
cambium of the vicinity began an active growth, and act 
siderable quantity of meristematic tissue intervened be 
the central parenchyma and the bast cells of the fibrovastillt 
bundle (fig. 6). es 
In one instance the knife in preparing the parts for g alti, 
had removed one side of a cell in the potato scion, 
a cell of the stock had suffered a similar loss, and it hap 
= 
which lived and grew. This large cell, however, 
delicate wall across its middle, forming two cells each of nom 
size, and providing such a neat union between stock rs a 
that it was almost impossible to detect it, the ee es 
knife showing no thickened wall, with but here yee 
few fragments of dead walls projecting into the newly 
cell. See fig. 7. : ee 
The graft which presented the above interes tea 
showed in an admirable way the action of Cot ber 
closing up spaces existing, immediately after the 
between members of the graft. 
from 
As previously stated the removal of pressure . 
d induces elong@ 
n it 
the cells had elongated towards the in 
length was four times their width; d eee sé 
passed transversely across the cells dividing f near tht 
of small cells. These transverse walls appe parses 
end of the cell at first, and when any variati 
in the smaller cells, as was often the oe 
mote from the injured surface was the larges oung w. 
nation revealed, in many instances, delicate YO" 
