266 GENETICS [BoT. Absts., Vol. VII, 



logical and experimental studies on the sex determination of Dinophilus apatris Korsch.) Arch. 

 Mikrosk. Anat. 93 (Sec. 2): 17-140. 4 pL, 5 fig. Nov., 1919.] Zeitschr. Indukt. Abstamm. 

 u. Vererb. 24: 290-291. Nov., 1920. 



1838. SiRKS, M. J. [Dutch rev. of: Rabatjd, E. Recherches sur I'heredite et la varia- 

 tion. Etude experimentale et theorie physiologique. (Studies on heredity and variation. 

 Experimental study and physiological theory.) Bull. Biol. France et Belgium. Suppl. 1. S13 p. 

 1919.] Genetica 2 : 471-475. Sept., 1920. 



1839. Smith, Bertram G, The individuality of the germ-nuclei during the cleavage of the 

 egg of Cryptobranchus allegheniensis. Michigan Acad. Sci. Ann. Rept. 21 : 105-107. 1919. — 

 A preliminary report of a detailed paper of the same title published in Biological Bulle- 

 tin 37: 246-287. 1919. — The author finds that during the fertilization of the egg of Crypto- 

 branchus (Urodele) the egg and sperm nuclei do not fuse. In the first cleavage mitosis each 

 of these nuclei gives rise to a separate group of chromosomes whose descendants pass sepa- 

 rately to daughter-nuclei. This duplexity persists, and "The genetic continuity of each half 

 of the double nucleus has been clearly traced to an advanced cleavage stage." — C. L. 

 Parmenter. 



1840. Stuart, C. P. Cohen. Die Ziichtung der Teepfianze. [Breeding of the tea plant.] 

 Zeitschr. Pflanzenziicht. 7: 157-204. 8 fig. June, 1920.— Brief discussion on species classifi- 

 cation of various botanists is given. One species. Camellia theifera (Griffith) Dyer, is 

 considered sufficient to cover all types. As in the case of species, confusion exists in the sepa- 

 ration of varieties. Comparative study of varieties or sorts and biotypes is made, so that it is 

 possible to recognize and select valuable kinds. Seeds of light weight were found to usually 

 produce inferior plants. Selection of seed, varying from 13 to 19 mm. in diameter, showed 

 no effect according to Bernard. Variation of a population in time of blooming, disease 

 resistance, branching habit, type and sterility is given in a table. A careful statistical 

 study was made of leaves of numerous races in regard to length, breadth, etc., and the results 

 tabulated. Branching habit was separated into two types and other minor differentiating 

 characters were mentioned. Physiological differences as resistance to diseases were thought 

 to exist. Variation was found in content of caffein and tannin but differences in yield were 

 difficult to measure. Partial correlation was found between leaf length and breadth and 

 strong individual correlation between length of leaf and tip of leaf. Morphological-physio- 

 logical relation apparently exists between leaf tip and tannin content, at least only races 

 with a tip over 9 mm. contained more than 15 per cent tannin. Descriptions are given of floral 

 structure and inflorescence. Four forms of sterility occur, namely, bud, bloom, fruit and 

 seed. — -Richard Wellington. 



1841. TiscHLER, G. [German rev. of: Allen, C. E. A chromosome difference correlated 

 with sex difference in Sphaerocarpos. Science 46: 466-467. 1917. Idem. The basis of sex 

 inheritance in Sphaerocarpos. Proc. Amer. Phil. Soc. 58: 289-316. 28 fig. 1919. (See Bot. 

 Absts. 4, Entry 486.)] Zeitschr. Indukt. Abstamm. u. Vererb. 24: 182-183. Sept., 1920. 



1842. TiscHLER, G. [German rev. of: Ktjwada, Y. Die Chromosomenzahl von Zea 

 Mays L. Ein Beitrag zur Hypothese der Individualitat der Chromosomen und zur Frage iiber 

 die Herkunft von Zea Mays L. (The chromosome number of Zea Mays L. A contribution to 

 the hypothesis of the individuality of chromosomes and to the problem of the origin of Zea 

 Mays L.) Jour. Coll. Sci. Imp. Univ. Tokyo 39'": 1-148. 2 pi., 4 fig- Aug., 1919. (See 

 Bot. Absts. 4, Entry 643.)] Zeitschr. Indukt. Abstamm. u. Vererb. 24: 294-295. Nov., 1920. 



1843. TiscHLER, G. [German rev. of: Rosenberg, Otto. Chromosomenzahlen und 

 Chromosomendimensionen in der Gattung Crepis. (Chromosome number and chromosome 

 dimensions in the genus Crepis.) Ark. Bot. IS^': 1-16. 6 fig. 1918. (See Bot. Absts. 3, 

 Entry 284.)] Zeitschr. Indukt. Abstamm. u. Vererb. 24: 294. Nov., 1920. 



