116 BOTANICAL GAZETTE 
Experiment 29.—Stems were cut off and the lower part placec 
in water. Above the water a deep notch was cut in each stem. Rt 
developed abundantly at the lower end in the water, and also jut 
above the notch. The vessels being cut off from the water suppl, 
the tissues were quite wilted and shrunken. In the dry air the roots 
did not elongate more than 1-2™™, but if the airs 
moist they grow vigorously (fig. 9). If, as stated,a 
portion of the stem is surrounded by water, no roo 
appear {on this part so long as the roots are 
below (jig. 6); but if the latter are cut off, 
appear at the former place as well as at the 
below from which they were removed. But the out 
ting off of the root system in this case cannoti 
ence the amount of water in the stem, unless it be 4 
diminish it. 
Experiment 30.—The plant was fixed as show 
in fig. 10. Below the cylinder of water su 
ing thefstem a notch was cut about one-thi 
way through the stem. This severed the cot 
with the root, along these bundles, from’ this 
upwards. Y Roots appeared in the water above, 
the sideQ directly above the notch, and from 
bundles ‘severed by it. Here again, if the cum 
\ of the notch had any effect on the amount of 
‘in the part of the stem directly above it, 
only be to diminish it, yet its effect was to 
roots there. 
Experiment 31 (fig. 11).—Both portions @ 
are in the water, and if there is any difference 
the better chance of becoming saturated; yet?® 
produces roots. 
Experiment 32 (fig. 12).—The apical | 
inverted in water and. the basal in somewhat 
air, but allowing considerable evaporation. 
— roots at all come on the former, but om ! 
many primordia are formed and break th 
cortex, and a few grow out into the air. If the air be kept sé 
or the end surrounded by water, many roots grow out vigol 
