No. 3, April, 1921] GENETICS 257 



1779. Jones, D. F. Sterility in animals and plants. Sci. Amer. Monthly 2:117-119. 

 7 fig. 1920. ^Hereditary lethal factors, when received from both parents, prevent develop- 

 ment of offspring.— C/i«s. H. Otis. 



1780. Jones, D. F. Segregation of susceptibility of parasitism in maize. Amer. Jour. 

 Bot. 5: 295-300. June, 1918. — 'Segregates from long-inbred maize show striking differences in 

 susceptibility to corn smut and an unidentified leaf blight. Crosses with resistant strains 

 give approximately resistant Fi and segregation again in F2. Indicates susceptibility com- 

 monly recessive, being segregated in some lines and not in others. Supports his earlier 

 hypothesis that increased development shown by hybrids is due to conjunctive action of 

 large number of favorable, dominant growth factors contributed by both parents. — Merle 

 C. Coulter. 



1781. Jones, D. F., and W. O. Filley. Teas' hybrid Catalpa. Jour. Heredity 11: 16-24. 

 6 fig. 1920. — J. C. Teas, of Carthage, Missouri, grew seed of Catalpa Kaempferi which was 

 growing near the two North American species C. bignonioides and C. speciosa and obtained a 

 vigorous-growing hybrid. The parentage has been established by Dr. E. M. East and H. 

 K. Hats who made the back-cross C. bignonioides X C. Kaempferi and obtained a similar 

 hybrid. These hybrids are more hardy and more rapid-growing than either parent but are 

 intermediate in most of the fruit, flower and tree characters which add, however, to its 

 value as an ornamental. — •/. //. Beaumoyit. 



1782. Jordan, David Starr. War and genetic values. Jour. Heredity 10:223-225. 

 Ma}-, 1919.— A denunciation of the theories of Dr. McFie, Dr. Thorstein Veblen, and others, 

 who contend that war does not affect the eugenic level of a race or nation. The writer con- 

 tends that war does remove many of the higher intellects and combined with the corollary losses 

 due to war is detrimental to the moral and intellectual status of the nation. His theme is: 

 '•Restoration in quantity is a matter of time, but restoration in quality, in values, moral, 

 mental, and physical, will be a much longer and more difficult process." — /. //. Beaumont. 



1783. Kalt, B. Die Hintertuxergerste. Ein Anbau- und Ziichtungsversuch. [Hintertux 

 barley. A cultural and breeding experiment.] Kuhn-Arch. 7 : 217-240. 1918. — Author reports 

 observations on a barley raised from seed grain secured from station of 1500 m. altitude. 

 Plants proved a very early-maturing form of Hordeum distichum nutans having long stem, 

 long, open, heavy heads, long, heavy grain, little tillering (Bestockung), and high nitrogen 

 content. Last two characteristics considered not desirable. It is now planned by breeding 

 to increase tillering in this barley without decreasing earliness, and to lower nitrogen 

 content. [From anonymous review in Zeitschr. Pfianzenziicht. 7: 39-40. June, 1919.]— 

 James P. Kelly. 



1784. Kammerer, Paul. Dunkeltiere im Licht und Lichttiere im Dunkel. [Darkness 

 animals in light and light animals in darkness.] Naturwissenschaften 8: 28-35. 5 fig. 1920. 

 —Reviews and spiritedly defends against critics his interpretation of results of experiments 

 published in 1912. The Austrian cave salamander, Proteus, normally has a small eye which 

 in the adult is about double in size that of the young but the overlying thick skin contains 

 the usual glands, sense organs, and slime cells and renders the eye difficult to find. The 

 lens cells undergo some degeneration. Twenty-three young, born and reared in a cistern at 

 the Vienna station, had distinct but very small eyes. In daylight the skin becomes black 

 but the eyes are really in darkness under the skin. Only such light, e.g., that from a red 

 incandescent bulb, as does not cause pigment development, will continue to illuminate the eye 

 fully. Author exposed one Proteus five years to a red incandescent light and five individuals 

 alternately to red light and daylight. The latter developed some pigment but not enough 

 to shield the eyes from light. Figure of one of these individuals shows a prominent eye. 

 Lens in one subjected to red light was 18 times longer and 12| times wider than in normal; 

 lens fibers attached to ciliary body; a true cornea and iris with pupil; skin over eye thin, 

 transparent, and lacking in glands, etc. The eye stands out like a glass ball and has the 



