OOGENESIS, SPERMATOGENESIS, ETC. Gen. Sub. 49 
matozoa of Paludina vivipara ; von Erlanger (191). — Spermatozoa of 
Dccapoda\ Brandes (76). — Intermediate cells of testis; von Bardeleben 
(31), von Lenhossek (440). — Intermediate substance of the testis; Stieda 
( 683). — False endothelium of seminiferous tubules; Regaud (596). 
c. Maturation. 
Historical note on polar bodies. Giard interpreted them as equivalent to 
ova in 1876 ; Giard (272). — Theory that polar bodies are morphologically 
equivalent to ova stated by Giard 1876, and by Mark in 1881. Emphasis 
on the differences between polar body formation and typical mitosis ; van 
Beneden (46). 
Reduction processes in plants and animals; Haccker (308). — Facts of 
chromosome-reduction versus postulates of Wcismann ; reduction not the 
result of nuclear division ; Haecker’s conclusions not universally true ; 
Moore (517). — Differentiation of germ-cells, a new mode; Hacker (310). 
Maturation processes in dog ; Bonnet (66) : In salamander and Pleuro- 
deles ; Carnoy & Lebrun (104): In Asplanchna ; Erlanger & Lauter- 
born (197): In Prosthecerceus, Klinckowstrom (395) : In frog; Morgan, 
T. H. (522) : In degenerating ova of Mammals ; Rabl (591) : In Amphioxus, 
especially tho second directive spindle ; Sobotta (669) : In ovum of rabbit ; 
Sobotta (673) : In Myzostoma ; W heeler (765). 
Behaviour of centrosomes in tho formation of polar bodies in Diaulula 
Sandiegcnsis ; MacFarland (467). 
Chromatic tetrads ; Wilcox (770). — Reduction of chromosomes in oogen- 
esis of Ascaris megalocephala bivalens , Sabaschnikoff (632). — Nuclear 
elimination in unicellular animals, compared with similar processes in 
ova; Cuisnot (137). — Some activities of polar bodies ; Andrews (6). 
< Physiological import of maturation, the process weakens the vitality 
of the ovum so that it is unable to digest the spermatozoon, as an immature 
ovum does; Iwanzoff (370). 
d. Fertilisation. 
The present state of knowledge in regard to fertilisation ; II/ECKEr(311), 
Zoja (784). 
Molecular attraction a factor in fertilisation; Herrera (347). 
Fertilisation and insemination in dog; Bonnet (66): Insemination, 
artificial ; Heape (324) : In Ascaris megalocephala ; Carnoy & Lebrun 
( 105): In Ascaris ; von Erlanger (188 & 189): In Asplanchna-, Erlanger 
& Lauterborn (197): In Allolobophora foetidus; Foot (232): In Prosthe- 
cerceus ; Klinckowstrom (395) : In Pleurophyllia calif or nica ; MacFarland 
( 467): In frog; Morgan, T. H. (522): In the lancelet; Sobotta (669): 
In Thysanozoon Brocchi ; Van der Stricht (688): In Myzostoma ; Whee- 
ler (765) : In Rhizopoda ; Hertwig, R. (352). 
Mechanical stimulus (gentle rubbing) seems to favour the parthenogenetic 
development of silkworm ova ; PIsrez (559). 
Nutritive nature of fertilisation ; Iwanzoff (370). 
7. Embryological. 
a. General. 
Norm-plates for the study of the development of vertebrates; Part i, 
Pig; Keibel (383). — Human embryology, English edition of text-book; 
Minot (507). — Outlines of embryology of man and mammals; Schultze 
(658). 
The doctrine of germinal layers ; Heider (330). 
Yolk-syncytium and concrescence-theory; Virchow (737). 
