ALL- 
alloiogenesis (al'oidjén’ésis) wm. ([Gk. 
alloios, different ; gemeszs, descent. 
The alternation in a life cigs of 
1 form ; 
n of gener iesins "(ba zol.). 
peste (al’6pélaj'ik) a. [Gk. adlos, 
r; felagos, sea.| Pert. organ- 
isms or A a d 
Ma asma make n 
moulded. ] “Ap pl. the differentiated 
portion of call Stina cyt.) 
alloplast (Al'éplast) 7. (Gk. 
other ; ne formed.] A morpho- 
aical cell- nig of more than one 
canes of tiss a 
Sipe kivt Hoo. ~ [L. adluere, 
to.] Pert. or found in 
sien laid Heo pe running 
water (fa/.). 
alsinaceous (alsina’ shiis) @. [Gk. 
alsine, chickweed.] AZp/. a poly- 
petalous corolla where intervals 
occur between the petals, as in the 
chickweed (4o2.), 
ration theory,— explains the 
electromotive forces of nerve and 
muscle byalterations i in the chemical 
— sitio sea of si tissue at the 
ee 
alterna ° (Alternat, “eee fesse _ ee 
a erste one after another.] 4 
leaves or s seesicetes : 
different levels on opposite sides of 
the stem (407), 
ernation of generations, — the 
ently produced, as in the po lypoid 
and medusoid stages of Hydroids 
biol.). 
alternati s,—it is the general 
rule that leaves of the diffe 
one ly 
Al'triséz) n. plu, 
[L. alérix, nourisher.] Appl. birds 
ng are hatched in a very 
mmature condition (zoo/. 
aint (aVala) #”. [L. alula, dim, of 
10 
AMB- 
ala, wing.| A small lobe separated 
off from the wing-base on its pos- 
terior edge in certain insects ; false 
wing of birds (zoo/.). 
alveola ite 6la) 7m. 3 colus, a 
vity. ] 2 sid on ae pane ce 
of an organ (0 
alveolus, 
t 
small cavities in the — 
alveolar point—see pro: 
alveolate (alvé’ 6lat)a. [L. aes wa 
pi te Deeply pitted or honey- 
co 
sivas (alvé “6liis) 7. ‘agp 
a small pit.] A tooth socket or 
small pit or depression (amaz.) ; the 
pyramidal ossicle s Ate a tooth 
in the sea-urchin (zoo 
— ‘oath es te ett cavity.] 
white layer on the ven ntricular 
lveolus, 
C) 
cells occurring in the inner nuclear 
layer of the retina (anaz). 
ambidextrous (Am’bidék’striis) a. [L. 
ambo, both; dexter, right.] Able 
to use both hands with equal ease. 
— (4am’biénz) #. [L. amdire, to 
go round] A thigh muscle i in cer- 
tain birds, the 
the toes to grasp the perch lesal . 
ambiparous (Ambip’arii —— L. améo, 
oth; parere, to be : Appl. 
buds as they contain the benonaa 
of both flowers and leaves (404), 
i pee 
Gk. spore 
megasporangia and microsporangia 
bot. 
ambital (4m’bital) a. [L. amdire, to 
go round, Z. interambulacral 
me antambulacral plates of Aster- 
; the outer — of arm of 
_Ophiuroias (zool, 
us (Am’bitiis) n. os ambire, to 
wo aroun The er edge or 
margin of a thing ; on outline of 
an echinoid shell viewed from the 
apical pole (zoo/.). 
