44 GENETICS [Box. Absts., Vol. VIII, 



consisting of a board with 2 rows of independently revolving spools, suitably labelled, by 

 which the various combinations of genes in two paired chromosomes may be illustrated. — 

 H. J. Banker. 



287. La Vattlx, R. de. L'intersexualite chez un Crustace Cladocere: Daphne Atkinsoni 

 Baird. [Intersexuality in a crustacean Cladocera, Daphne Atkinsoni Baird. Compt. Rend. 

 Acad. Sci. Paris 169:97-99. July> 1919. 



288. LiLLiE, Frank R. The initial event in fertilization. [Abstract.] Anat. Rec. 20: 

 225. 1921. — The initial event in fertilization has a primary significance because all others 

 depend for their occurrence upon it and for their degree of efficiency upon its quantitative 

 value. The initial event also displays a high degree of simplicity in relation to subsequent 

 events. — Two new methods of study are applied in this paper to its study: First, the effect of 

 copper salts upon the fertilization reaction; second, a comparison of the relative degrees of 

 specificity between sperm agglutination by egg secretions and the fertilization reaction 

 itself. — Copper has an incomparably greater effect on the initial reaction in fertilization 

 than on later stages of Arbacia. It may therefore be used for an analysis of this reaction. 

 The results indicate the presence of a copper-avid substance in the cortex of the egg that is 

 responsible for activation. — The specificity of sperm agglutination by egg secretions between 

 2 species of Strongylocentrotus is found to be of the same order as fertilization specificity. — 

 The copper-avid substance of the cortex of the egg is to be identified with the sperm- 

 agglutinating substance of egg secretion and with the fertilizin of previous papers. — 

 Frank R. Lillie. 



289. LoTSY, J. P. Eenige resultaten van het Oenotherajaar 1920. [Some results of the 

 Oenothera year 1920.] Genetica 2: 481-528. 57 fig. 1920. 



290. LoTSY, J. P. [Dutch rev. of: Honing, J. A. Erfelijkheidsleer zonder Evolutie 

 theorien. Rede uitgesproken bij de aanvaarding van het Hoogleeraarsambt aan de Landbouw- 

 hoogeschool te Wageningen 23 Nov, 1920. [Genetics vs. theories of evolution. Lecture given 

 on assuming the office of Professor at the Agricultural School of Wageningen Nov. 23, 1920. 

 H. Veenman: Wageningen, 1920.] Genetica 2: 536-537. 1920. 



291. LoTSY, J. P. [Dutch rev. of: Tackholm, G. On the cytology of the genus Rosa. 

 A preliminary note. Svensk Bot. Tidskr. 14:300-311. 3 fig. 1920. (See Bot. Absts. 7, 

 Entry 243.)] Genetica 2 : 547-554. 1920. 



292. McClung, C. E. The chromosomes in fertilization. [Abstract.] Anat. Rec. 20: 

 228-229. 1921. — 1. The process of fertilization consists essentially in the introduction into 

 the egg of a simplex series of chromosomes, duplicating the series left there by oogenesis. 

 Little or no other material is carried by the spermatozoon. — 2. Since genetic experiments indi- 

 cate the equivalence of male and female in heredity, the importance of the '•hromatin is dem- 

 onstrated. — 3. Behavior of characters in inheritance, indicating factor differences and group- 

 ings, are paralleled by conditions of structure and behavior of the chromosomes. — 4. The 

 chromosomes introduced by the spermatozoon are reduced to the smallest volume and con- 

 tain chromatin in the most condensed condition. — 5. The chromatin quickly absorbs fluid 

 from the egg cytoplasm and forms a nuclear vesicle in which the chromosomes later appear in 

 the size, form, and number that marked them in the spermatid. — 6. Upon union of the egg 

 and sperm pronuclei the paternal chromosomes may remain distinctly grouped and this segre- 

 gation may be followed through many generations of cells. — 7. The individual paternal chro- 

 mosomes may be traced into the body cells of the embryo and are found later in the germ 

 cSHs. — 8. During the many generations between the ovum and the adult organism in which 

 maturation occurs, the chromosomes have reproduced themselves, each time under different 

 conditions in the organization and constitution of the body, so that in the germ cells they 

 must emerge somewhat different in character from what they were on entering. — 9. At the 

 period of maturation in the germ cells, however, the homologous elements from the two 



