STUDIES IN GENERAL PHYSIOLOGY 
From the lower apical end sprang the downward- 
growing roots W, which remained much shorter 
than the roots W,. A complete heteromor- 
ls, phosis had therefore been produced, a 
root having been formed in place of the 
‘ old tip, and a stem in place of the 
~ \ \ root. JI now turned the whole animal 
‘ NS about a horizontal axis through an 
process the animal was placed 
FIG. 50 4 \ angle of nearly 180°, by which 
: in the position shown in the 
‘ ? drawing. The arrow indi- 
| cates the direction of the 
oo toumned i vertical. The tip of the 
at its lower end \; stem which was now 
e, and, besides, Ww, \e directed downward 
other Took, We IS ceased to grow, but 
Se iN the stem retained 
lower surface. These iN ; . : 
h be te aa NN its vigor and its 
spurned ce P NS normal appear- 
or entirely from the lateral IN Se ee 
branches. The old roots INS ° 
at a continued to live, so \S ia roots W, 
that the animal terminated in } + | 
roots at both ends. ii 
The same series of phenomena, 
differing only in detail, is shown in 
Fig. 50. The stem ab was suspended ™ | '{(} 
obliquely in the aquarium, the apical . 
end 6 being higher than a. The stem XK 
de sprang from the surface which at that i 
time had been uppermost, and from an ele- \ 
ment lying fairly low down upon the stem. 
Roots W sprang from the point which origi- 
o& 
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