Developmental   pathways   of  the   water   mold

Blastocladiella  emersonii,  I.
Developmental   pathways   of  the   water   mold

Blastocladiella  emersonii,  II.
Developmental   pathways   of  the   water   mold

Blastocladiella  emersonii.  III.
Down  feather  development  (Callus  domesticus),

I.
Down  feather  development  (Gallus  domesticus),

II.
Early  development  of  the  sea  urchin — cleavage

(Arbacia  punlulata).
Early  development  of  the  sea  urchin— fertiliza-
tion (Arbacia  punctulata).
Echinoderm  development;  cleavage  (Dendraster

excentricus).
Echinoderm   development:   fertilization   (Den-
draster excentricus).
Echinoderm  development;  gastrulation,  I  (Den-
draster excentricus).
Echinoderm  development:  gastrulation,  II  (Den-
draster excentricus).
The  Effect  of  temperature  on  the  axopods  of

Echinosphaerium  nucleofilum.
Epiboly  in  the  killifish  (Fundulus  heteroclitus),  1.
Epiboly  in  the  killifish  (Fundulus  heteroclitus),

II.
Epiboly  in  the  killifish  (Fundulus  heteroclitus),

III.
Experiments  on  the  chick  embryo;  making  a

window  in  the  shell.
Experiments  on  the  chick  embryo;  making  glass

operating  needles  and  microtacks.
Experiments  on  the  chick  embryo:  mesodermal

determination  of  limb  type,  II.
Experiments  on  the  chick  embryo.  Part  A;  Ex-
posing the  wing  bud.  Pan  B;  Sealing  the  win-
dow in  the  shell.
Experiments  on  the  chick  embryo;  removal  of

apical  ectodermal  ridge  of  a  limb  bud.
E.xperimenls  on  the  chick  embryo:  reversing  the

lip  of  the  wing  bud.
Experiments  on  the  chick  embryo;  the  chorioal-
lantoic graft.
Experiments  on  the  chick  embryo;   the  flank

graft.
Experiments  on  the  chick  embryo:  the  zone  of

polarizing  activity.
Extra-embryonic  circulation  in  the  chick.
Feeding  and  reproduction  of  Echinosphaerium

nucleofilum.
Frog  development:  cleavage  (Rana  pipiens).
Frog  development:  fertilization  (Rana  pipiens),
Gabriel  is  2  days  old.
Girls  at  12.
Heart  development  in  the  chick  embryo.
Induced  twinning  in  the  sea  urchin  (Arbacia

punctulata).
The  Inquiring  mind.
An  Introduction  to  the  marine  slime  mold  Laby-
rinthula,  I.
An  Introduction  to  the  marine  slime  mold  Laby-

rinthula,  II.
Keith  turns  18.
Kitchen  physics.
