b4 ZOOLOGY. 
The process of budding is but a modification of that in- 
volved in natural self-division, and it is carried on to a great 
extent in Hydra, a much larger number of individuals being 
produced in this way than from eggs. Our figure (36) 
shows two individuals budding out from the parent Hydra ; 
the smaller bud (@) is 
a simple bulging out 
of the body-walls, the. 
bud enveloping a por- 
tion of the stomach, 
until it becomes con- 
stricted and drops off, 
the tentacles mean- 
while budding out. 
from the distal end, 
and a mouth-opening 
arising between them, 
as at c. Budding in 
the Hydra, the Acti- 
@ nia, and, in fact, all 
the lower animals, is. 
simply due to an in- 
crease in the growth 
and multiplication of 
A, cells at a special point 
on the outside of the 
body, while the asex- 
ual mode of reproduc- 
tion in the Aphis and 
a few other insects: 
results from the mul- 
; ; tiplication of cells at. 
aing from 14, bc the base; athe digeeove cavity: 4, & particular point (the 
tentacles. —From Clurk’s Mind m Nature ov ary) in the inside of 
the body. Thus Parthenogenesis or Agamogenesis is analo- . 
gous to the ordinary mode of budding. Ehrenberg first showed 
that the Hydra reproduces by fertilized eggs. Kleinenberg 
describes the testis, which is lodged in the ectoderm, and 
which develops tailed spermatozoa like those of the higher 
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