OOGENESIS, SPERMATOGENESIS, ETC. Gen . Sub . 59 
R. Fick (230).—In Ciona ; Golski (283).—In Thalassema and Zirphcea ; 
Griffin (289). — In Hydatina senta; Lenssen (445). — Maturation in 
Sponges, showing mitosis; Maas (486).—Description of the two directive 
spindles in ovum of mouse; the first often suppressed; Sobotta (728).— 
Anomalies in the formation of polar globules; Van der Stricht (779). — 
In Planarians; Van Name (783). 
d. Fertilisation. 
Summary; Fick (231).—Practical course on fertilisation and cells; 
Haecker (300).—Fertilisation replaced as regards the eggs of Arbacia 
(sea-urchin) by altering the ions in the sea-water; Loeb (466).—Phe¬ 
nomena like cleavage induced by the action of salt-solutions on unfertilised 
ova; Morgan (552).—Ovulase, an alleged soluble ferment from Echinoid 
spermatozoa which induces segmentation; Pieri (614).—Effect of stale¬ 
ness of sex-cells on development of Ecliinoids; Vernon (790).—Fertil¬ 
isation as a source of variations; Lignier (453). 
Merogonic fertilisation; effective fertilisation of non-nucleated fragments 
of the ova of Echinus , Dentalium , and Lanice conchilega ; Delage (163- 
165).—Essence of fertilisation—a union of the sperm-nucleus with the 
cytoplasm of the ovum; Delage (165).—Is merogonic development not to 
be interpreted as due to the parthenogenesis of the microgamete ?; Giard 
(276). 
In Aplysia depilans; Bochenek (66).—In Ciona intestinalis ; Golski 
( 283).—In Cerebratulus ; Coe (130).—Fertilisation in Thalassema and 
Zirphcea’, Griffin (289).—In Petromyzon jluviatilis; Herfort (331).— 
Fertilisation, conditions of, in Protozoa; Hertwig, R. (345).—In Sponges 
(.Sycandra raphanus ); Maas (486).—In Planarians; Van Name (783).— 
In Rhynchelmis ; Vejdovsky (787).—In Ecliinoids; Vernon (790).—The 
centrosome in fertilisation; Le Dantec (435). 
7. Embryology. 
a. General. 
Tendencies of modern Embryology; Bergh (58).—Summary as to 
recent advances in general embryology; Mehnert (522 & 523).—Principles 
of animal development, illustrated from the whelk’s egg; Beard (48).— 
Problems of development; Bard (39).—Localised stages in development; 
Jackson (373).—The recapitulation-doctrine and cenogenesis; Keibel 
( 392).—Discussion of the recapitulation doctrine; Rabl (635).—Von Baer’s 
recognition of the frequency and import of individual variation in em¬ 
bryonic development; Mehnert (520).—Wolff and the Theoria Gen¬ 
eration^; Wheeler (824). — Anlage and Rudiment; Mark Baldwin 
( 36).—Behaviour of embryonic cells implanted in the adult body; Birch- 
Hirschfeld & Garten (64).—Localisation of morphogenetic processes; 
Driesch (181). — Results and problems of physiological embryology; 
Driesch (183).—Developmental mechanics; Rhumbler (656a).—R eport 
on developmental mechanics; Mehnert (523). — Developmental mechanics: 
a new branch of biology; Nusbaum (577).—Review of Mehnert’s Principles 
of Development; Thomson (761).—The architecture of bone corresponds 
in detail to the functional strains and stresses; Wolff (845).—Physio¬ 
logical morphology illustrated in development of Cerebratulus lacteus\ 
Wilson, C. B. (837).—Homotropism and allotropism, etc.; Roux (674).— 
Effect of staleness of sexual cells on development of Ecliinoids; Vernon 
( 790). — First appearance of bilateral symmetry in development; 
Schultze, O. (702).—Bilateral symmetry of Amphibian ovum; Schultze, O. 
