No. 3, January, 1922] GENETICS 163 



that hemp pollinated with fresh pollen produces a great preponderance of staminate plants 

 while pollination with old pollen (12 hours old) gives a preponderance of carpellate plants. 

 Ciesielski's results were not substantiated as the author obtained an average of 37.77 per 

 cent staminate and G2.27 per cent carpellate plants with fresh pollen and 38.55 per cent stamin- 

 ate and G1.45 percent carpellate plants with pollen 12 hours old. With pollen 30 hours old45. 14 

 per cent staminate and 54.80 per cent carpellate plants were obtained, while pollen 36 hours 

 old gave 40.25 per cent staminate and 59.75 per cent carpellate plants. These numbers all 

 come within the natural fluctuation of the sex ratio of hemp. The author thinks the pro- 

 gressive increase in the proportion of staminate to carpellate plants with increased age of the 

 pollen might be due to a difference in the vitality of male- and female-determining pollen grains 

 resulting in elimination of the weaker group. — John H. Schaffner. 



1064. LiNDSTROM, E. W. Chlorophyll factors of maize. Jour. Heredity 11: 269-277. 

 S fig. 1920. — Factors responsible for chlorophyll deficiencies which decrease or limit the 

 productivity of maize are apparently present in a number of diiTerent chromosomes. The 

 elimination of such chlorophyll deficiencies by inbreeding will result in the loss of the favorable 

 growth factors located in the same chromosomes. For this reason material relatively free of 

 abnormalities should be chosen for inbreeding, and it is probable there would be very little 

 loss of stature, yield, or fertilitJ^ — W. H. Eyster. 



1085. LiPPiNCOTT, William A. A hen which changed color. Jour. Heredity 11: 342- 

 348. Fig. 1-7. 1920. — This is an account of a pedigreed Blue Andalusian hen which gradually 

 became pure white through replacement, at successive annual molts, of colored feathers by 

 white ones. The bird was bred and shown by several tests to have retained her original 

 genetic constitution. — H. D. Goodale. 



10G6. LoMEN, G. J. The reindeer industry in Alaska. Jour. Heredity 11: 243-252. Fron- 

 tispiece, 10 fig. 1920. — The reindeer's characteristics and habits are briefly described, and the 

 significance of the antlers is discussed. Small antlers are considered a sign of deterioration 

 while straight antlers are believed to indicate sterility. The doe gives birth to 1 (rarely 

 2) fawn annualh'. The period of gestation is 7 months and 7 days, and the does continue 

 to breed until 14 or 15 years of age. There is necessity for improvement due to inbreeding of 

 the Siberian stocks first imported, and to the possible use of the caribou as a source of improve- 

 ment. — Edward N. Wentworth. 



1067. Lush, Jay L. Inheritance in swine. Jour. Heredity 12: 57-71. Fig. 6-19. 1921. 

 — The author reports on the data accumulated in a series of experiments conducted at the 

 Kansas Agricultural Experiment Station. These experiments, interrupted by the war, ended 

 with the Fi and F2 generation. To study litter size the wild boar, which normally produces 

 4 pigs at a birth, was crossed to the Tamworth, which normally produces about 11 pigs. One 

 Fi sow produced 4 pigs indicating a dominance of wild litter size. Inter-crosses of Berkshires, 

 Tamworths, Duroc-Jerseys, and wild indicated that the erect carriage of ear is dominant, 

 although dependent on more than 1, but less than 3, factors. Sharp dish of face and short 

 face proved dominant to other classes. The production of bright pigment was found to be 

 dependent on a single factor difference, while the differences between red, white, and sandy 

 were shown to be due to 2 factors, either one of which in the absence of the other probably 

 produces sandy, while one intensified the other to produce red; absence of both causes white. 

 Comparison of growth curves in Fi and F2 generations is significant only in so far as it in- 

 dicates increased variability for the F2 generations, the average difference in the coefficients 

 of variabilitj' at ages 1-13 months being about 6 per cent. — Edicard N . Wentu-orth. 



1068. Maas, J. G. J. A. Betrouwbaarheid van veldproeven bij Hevea. [Reliability of 

 field experiments with Hevea.] Arch. Rubbercultuur 2: 560-607. 1918. — The application of 

 statistical methods to data from field experiments with Para rubber is discussed. The princi- 

 pal factors which cause variability are given, and the extent to which these factors may be 

 controlled by the experimenter is considered. The writer believes the standard deviation to 



