50 Gen. Sub. 
I. GENERAL SUBJECTS. 
c. Maturation. 
Maturation of germ-cells, general account ; Wilson (720). — The ques- 
tion of reducing divisions ; Ruckert (589). — Anomalies in the formation 
of the amphiaster de rebut ; Van dee Striciit (654). 
Maturation and fertilisation of the Vertebrate ovum ; Sobotta (638). 
— Polar bodies in ovarian ova of Mammals; Janosik (411). — Matura- 
tion in Amphioxus ; Van dee Striciit (652). — Maturation in Ciona and 
general : Castle (105). — Maturation in Fulgur carica (Gasteropod). 
The single large polar body turns out to be a small yolk-lobe. There are 
two or three true polar bodies ; MacMtjrrich (436). — Reduction of 
chromatin in maturation of ova of Copepods, Ac. ; vom Rath (555). — 
Maturation in Thalassenui; Griffin (282). — Maturation in the ovum of 
Thysanozoon brocchi ; Van der Striciit (653). 
d. Fertilisation. 
General account of fertilisation ; Wilson (720). — Fertilisation in 
relation to hereditary transmission ; Blanc, H. (70). 
Artificial insemination of Mammals ; Heape (312) : in rabbits ; 
Grusdew (285). 
Fertilisation in certain newts ; Fisciier-Sigwart (225). — Methods of 
fertilisation in some American newts; Kingsbury (363). — In Amphi- 
oxus ; Van der Striciit (652). — Behaviour of so-called achromatin 
substance in the fertilised egg of Physa fontinalis ; Kostanecki & 
Wierzejski (379). — Fertilisation in Ciona and general; Castle (105). — 
Fertilisation in Thalassema ; Griffin (282) : in Ascaris meyalocephala ; 
Eblanger (206, 207). 
Anomalies in Echinoderm ova after fertilisation ; Schenk (608). 
, Development of unfertilised sea-urchin ovum ; Hertwig, R. (330). 
7. Embryological. 
a. General . 
Reprint of Wolff’s “ Theoria generations ” (1759) ; edited by Samassa ; 
Wolff (727). Review of Roux’ work; Born (77). 
Theory of development; Chalmers Mitchell (473a). — Theories of 
development; Wilson (720). — Discussion of Driesch’s “analytical 
theory of organic development ” ; Roux (586). — Preformation or epi- 
genesis? Hertwig (328). — Epigenesis and evolution; Samassa (597). — 
As an ovum of sea-urchin after serious loss of substance can still form 
a normal embryo, Weismann’s theory of determinants cannot be 
generally true ; Rawitz (558). — The machine-theory of life ; Driescii 
(167). — Answer to Driesch’s article on the machine- theory of life ; Roux 
(588). — Significance of ancestral rudiments in embryonic development ; 
Sedgwick (626). — Von Baer’s Law; Sedgwick (626). — Answer to Con- 
way MacMillan’s criticism of Beard’s theory of antithetic generations; 
Beard (50). — Progressive differentiation of cells in the development 
of the organism ; Nussbaum (503). 
Growth of embryos. Absolute growth is greatest in earlier stages, but 
gradually decreases as relative growth increases. Disproportions are 
common in early stages ; but correlation regulates these. At a given 
moment zones of active growth are distinguishable, and the growth both 
of the whole and of the parts is periodic ; Fisciiel (222). 
Germinal layers ; what is mesenchyme ? Ivastschenko (356). — The 
germ-layers of Chordates; Castle (105). — Development of germinal 
