EMBRYOLOGICAL. 
Gen. Sub. 71 
Experimental Embryology . 
Problems and methods of developmental mechanics ; Roux (596a). — 
Summary of researches on experimental embryology ; bearing on 
teratology ; general significance ; Benda (34). — Reprint of papers ; 
Roux (595). — Results of experimental investigations bearing on 
aetiology; Dreyer (157). — Rearing of half-embryos from either of 
first two blastomeres of Rana fusca ; the occurrence of post-genera- 
tion, corroboration of Roux’s results ; Endres (181). — In Ascidians : 
an isolated blastomere of 2-cell stage of Phallusia mammillatd 
may form a complete larva of about half the normal size. The 
sensory and adhesive organs may be defective, as in larvae reared from 
whole eggs in adverse conditions ; Driesch (160). — The first two blasto- 
meres of the newt ovum are equal to one another, and complete ; each 
forms a perfect and symmetrical embryo; Herlitzka (298). — The differ- 
ence between the results of Roux and Hertwig due to the difference in 
the position of the blastomere after operation ; reasons ; Morgan (474). 
— Development of individual blastomeres of Ctenophora ; Driesch & 
Morgan (159). — Note on the experiments of Driesch & Morgan on the 
development of Ctenophore-blastomeres ; Chun (108). — On experiments 
and observations on fertilised and unfertilised ova of Ctenophora. , by Chun, 
Driesch, and Morgan ; Roux (597). — Development of isolated blasto- 
meres in Medusae, &c. ; Zoja (779). — Development of double organisms 
from one ovum ; Loeb (403). — Relative dividing power of individual 
embryonic cells ; Bergh (37), Driesch (160). — Puncturing experiments 
on frog ova ; Endres (180), Endres & Walter (181).— Partial larvro of 
Sphcer echinus ; Morgan (477). — One embryo from two blastulm ; Mor- 
gan (475). — Pressure on Echinoid ova greatly increased the rapidity of 
mitosis, but nuclear division often occurs without cell-division ; macro- 
meres and micromeres are usually differentiated ; the spindles are always 
at right angles to the direction of pressure, and, generally, as Hertwig 
has shown, in the line of the largest plasma-masses ; Reinke (572). — 
Mechanical influences on development ; Westijoff (744). — Influence of 
chloride of lithium on the development of the eggs of frog and toad ; 
similar in the two cases ; probably has to do with the re- absorption of 
yolk-granules in the large yolk-cells; Gurwitsch (266). — Influence of 
lithium-salts and various organic salts on development ; Herbst (296).— 
Ova of frog subjected to l-*6 per cent, salt solution form monstrosities. 
The vegetative half is more inhibited and injured. Gastrulation is 
modified, and approaches that in meroblastic ova. Other effects are anen- 
cephaly, hemicrania, &c.; Hertwig (303). — Influence of diluted sea water 
on the development of Echinoid ova; Rawitz (564). — Influence of 
increased and diminished oxygen supply on cleavage ; Loeb (401). — - 
Influence of cold on maturation and fertilisation of ova of Ascaris mega - 
locephala. Cold renders polyspermy possible, tends to prevent fertilisa- 
tion, affects the yolk-substance, inhibits the formation of the vitelline 
membrane, alters the disposition and number of the chromatin-elements, 
