46 Gen , Sub, 
I. GENERAL SUBJECTS. 
c. Maturation. 
Maturation of the ovum in Mammals ; Hole (251, 252). 
Elimination of nuclear elements in ovarian ovum of Scorpcena scro/a ; 
van Bambeke (20). 
Maturation of parthenogenetic ova of Artemia ; Brauer (60). 
In Axolotl : The first polar body is expelled as the egg passes from 
ovary to oviduct, or in the uppermost part of the latter ; the second, 
after fertilisation. The spindles show neither polar rays nor centrosome ; 
Fick (157). 
In Lamprey ; True germinal vesicle and polar bodies now discovered ; 
Herfort (235). 
Maturation (Newt) ; Jordan (274). 
Maturation in Ophryotrocha : The equatorial plate of the first polar 
spindle has only a single tetrapartite chromosome, a condition only known 
elsewhere in A scans megalocephala , var. univalens ; Korschelt (297). 
d. Fertilisation. 
Summary and bibliography ; Boveri (54). — Nature and origin of ; 
Kxehler (293). 
Menstruation and fertilisation ; Auvard (12). 
In Mouse : The completion of the division which leads to the extru- 
sion of the polar body occurs after the spermatozoon has entered ; 
Sobotta (479). 
In Axolotl : There is physiological polyspermy. The whole spermato- 
zoon enters the ovum, at a point where there is a funnel -like or conical 
aggregation of protoplasm. The head forms the spermatic nucleus, with 
amoeboid movements ; the connective piece forms an attractive sphere ; 
the tail disappears completely ; Fick (157). 
Fertilisation, polyspermy, &c., in Newt ; Jordan (274) : in Styelopsis 
grossularia ; Julin (275). — Artificial fertilisation ; Onanoff (381). 
7. Embryological. 
Survey of embryological theories; Yialleton (514). 
Recapitulation theory ; Bather (30). 
Ontogeny and regeneration : Facts of regeneration show that the con- 
ception of parallelism between ontogeny and regeneration must undergo 
fundamental modification. Thus the pharynx of Microstoma (ontogenetic- 
ally ectodermic) may be regenerated from mesoblastic tissue, and so on ; 
Wagner (519). 
Considerations in regard to the homology of the germinal layers ; Maas 
(329). 
Germinal layers, theory of ; Hatschek (219). 
Cleavage, germinal layers, &c., summary and bibliography; Born 
(50, 51). 
