INHOUD 
DUPLICATION OF GENERATIVE NUCLEI BY MEANS OF 
PHYSIOLOGICAL STIMULI AND ITS SIGN IFICANCE, 
Blz. 
by Dr. W. E. pe Mor (with 18 illustrations on 6 plates). . . 225 
À CYTOLOGICAL INVESTIGATION OF SOME SPECIES 
AND SPECIES-HYBRIDS OF THE GENUS SACCHA- 
RUM, by Dr. G. Bremer (with 40 illustrations) II. . : . 273 
GENETICAL RESEARCH WITH MAIZE, by E. W. 
LINDSTROM. un. 0 un a a 327 
A PRELIMINARY STATEMENT OF THE RESULTS OF 
Mr. HOUWINK’S EXPERIMENTS CONCERNING THE : 
ORIGIN OFSOME DOMESTIC ANIMALS, by J. P. Lorsy : 
and K. KUIPER (with 14 illustrations on 2 plates).IV . . . 357 
BOEKBESPREKINGEN ‚er un een a oe 377 
E. BRAINERD and A. K. PEITERSEN, Blackberries of New 
England, door J. P. Lorsy. — B.M. Davis, Species Pure and 
Impure, door J. P. Lorsy. — J. A. HONING, Canna Crosses I, 
door J. P. Lorsy. — W. IssAJEw, Vererbungsstudien an tieri- 
schen Chimaeren, door M. A. van HERWERDEN. — F. W. OLIVER, 
Spartina problems, door J. P. Lotsy. — WALTER SCHEIDT, Ein- 
führung in die naturwissenschaftliche Familienkunde, door 
G. P. FRETS. | | 

BERICHT 
Dorénavant „Genetica” publiera les articles originaux en Allemand, 
Anglais, Français ou Hollandais, selon le choix des auteurs. 
In future original articles for „Genetica’’ can be written in Dutch, 
. English, French or German according to the preference of the 
authors. | 
Künftighin können, nach Wahl der Autoren, Originalmitteilungen in 
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