No. 1, Jolt, 1920] GENETICS 99 



009. Hiogins, J. Edgar. Report of the horticultural division. Eawaii Agrio. Exp. Sta. 

 Rept. 1918: 7, 8, 13-21. PI. 2, 3. 1919.— See Bot. Absts. 1, Entry 971. 



fill). ElLBON, G. R., and F. R. Pabnbll. A simple method of selfing cotton. Madras 

 Agric. Yearbook 1917: 54, 55. 1918. — Method consists of Bewlng unopened flower bud near 

 tip, passing thread also through involucre so thai when corolla falls it remains attached to 

 involucre, thus marking flowers which have been selfed. — T. 11 . Kearney. 



611. Hindu:, Edward. Sex inheritance in Pediculus humanus var. corporis. Jour. 

 Genetics 8: 267-277. / chart. Sept., 1919.— Breeding experiments with the clothes-lice were 

 begun in 1912 bul later were interrupted by the war and consequently are not very extensive. 

 Pairings were made and the resulting families were composed, in some experiments, of nearly 

 all male individuals, in some experiments of nearly all female individuals, while in others the 

 two sexes occurred in about equal numbers. It was suggested that there were two kinds of 

 females and two kinds of males according to their inherent capacity to produce male or female 

 offspring. During these experiments the lice were fed upon the human arm. — D. D. Whitney. 



612. Hodgson, Robert W. An avocado monstrosity. California Citrograph 5: 14-15. 

 1 fig. Nov., 1919. — Author describes seedling with the leaves near the apex of main stem re- 

 markably malformed, consisting of irregular masses of white fleshy tissue. No evidence of 

 injury by insects or fungi; bud mutation suggested as possible cause of abnormality. — Howard 

 B. Frost. 



613. Hoffmann, Hermann. Zum Problem der Vererbung envorbener Eigenschaften. 

 [The problem of inheritance of acquired characters.] Med. Klinik 15: 583-586. 



614. Hollander, Eugen. Familiare Fingermissbildung (Brachydaktylie und Hyper- 

 phalangie). [Familial abnormalities of the fingers (brachydactyly and hyperphalangy) .] Berlin 

 Klin. Wochenschr. 55: 472-474. 1918. 



615. Hollick, A. The story of the Bartram oak. Sci. Amer. 121 : 422, 429-430, 432. 6 fig. 

 1919.— The Bartram oak, after 175 years of doubt and controversy, is conclusively proven to 

 be a hybrid, with the willow oak and the red oak as the two parent species. — Chas. H.Otis. 



616. Holmgren, I. Zytologische Studien fiber die Fortpflanzung bei den Gattungen Erig- 

 eron und Eupatorium. [Cytological studies on reproduction in the genera Erigeron and Eupa- 

 torium.] K. Svenska Vet. Akad. Handl. 59 7 : 118 p., 24 fig. 1919.— The two nearly related spe- 

 cies Erigeron eriocephalus and E. imalaschkensis differ from each other both in the number of 

 chromosomes and in the evolution of the embryo sac. (All described types of evolution of 

 the embryo sac of the Compositae are to be found in the genus Erigeron.) — Erigeron annuus 

 is apogamous; within the genus Erigeron are to be found diploid, triploid, tetraploid and 

 hexaploid species with nine chromosomes as cardinal number. These numbers and the 

 appearance of the chromosomes is discussed in detail. Author believes that crossing has 

 taken the greatest part in the origin of species. — Eupatorium glandulosum produces seeds even 

 after castration. Eight sexual species of the same genus are also examined. The evolution 

 of the reproductive cells is very comprehensively described for E. glandulosum. — The treatise 

 is concluded with some theoretical discussions on the origin of apogamic species. Author 

 considers that between crossing, apogamy, doubling of chromosomes, absence of conjugation 

 of chromosomes, and absence of reduction division a certain relation exists. — He believes 

 namely that crossing under certain circumstances may release a tendency to apogamous evo- 

 lution. Even if all cases of apogamy might be related to influence of crossing, we will not on 

 this ground obtain a real explanation of the causes of apogamy. The paper contains impor- 

 tant compilation and discussion of literature. — K. V. Ossian Dahlgren. 



617. Hultkrantz, J. Vilu. Om rashygien dess forutsattningar, mil och medel. Skrifter 

 utgifna av Svenska Sallskapet for Rashygien. I. [On eugenics, its qualifications, purposes and 

 means. Publications edited by the Swedish Eugenical Association. I.] 21.5 X 14.5 cm., 54 p. 



