No. 2, September, 1920] GENETICS 201 



1520. HBNDRICKSON, A. H. Plum pollination. California Agric. Exp. Sta. Bull. 310. 28 

 p., -5 fig. July, 1919.— Experiments show 13 varieties self-sterile, 3 Belf-feri Lie and 1 doubtful. 

 Early-blooming Japanese varieties produce little pollen and are not efficient pollenizers. 



Late-blooming varieties produce abundant pollen. Excepl for the self-fertile Freneh and 

 sugar prunes interplanting of varieties is recommended to increase yields. No evidence of 

 Lntersterility among plum or prune varieties was found. Experiments show that bees are 

 efficient agents of cross-pollinat ion. Set of fruit is also influenced by climatic factors. — J. L. 

 Col! 



1521. HERREj Albert C. Hints for lichen studies. Bryologist 23: 26-27. 1920. — 

 See Hot. Al.sts. 5, Entry 1919. 



1522. Hertwig, P. [German rev. of: Boveiu, Tiikodor. Zwei Fehlerquellen bei Mero- 

 gonieversuchen und die Entwicklungsfahigkeit msrogonischer und partiellmerogonischer Seeig- 

 elbastarde. (Two sources of error in investigations of merogony and the ability of merogonic 

 and partially merogonic sea-urchin hybrids to develop.) Arch. Entwicklungsmech. Organ. 44: 

 117 471. S pi. 1918.] Zeitschr. indukt. Abstamm. Vererb. 22: 216-218. Mar., 1920.— See 

 also Bot. Absts. 3, Entry 600. 



1523. Hertwic, P. [German rev. of: Hertwig, G '/nther. Kreuzungsversuche an Am- 

 phibien. (Hybridization studies on amphibians.) Arch. Mikrosk. Anat. 91:203-271. 8 fig. 

 Aug. 20, 191S. See Bot. Absts. 3, Entry 1005. Zeitschr. indukt. Abstamm. Vererb. 22: 

 219 221. Mar., 1920. 



1524. Hilgexdorf, F. W. Methods of plant breeding. New Zealand Jour. Agric. 19: 

 351 358. 1919.— Popular. [See Bot. Absts. 5, Entry 1153.] 



1525. Hollander, Eugen. Familiare Fingermissbildung (Brachydaktylie und Hyper- 

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

 Klin. Wochenschr. 55: 472^474. 1918. — A man and his son, and probably also his sister, are 

 characterized by a shortening of the fingers accompanied by an extra bony element in the basal 

 phalanx of digits two and three. Evidence is brought forth to show that the extra element 

 is an ununited epiphysis, the inhibition of normal union being in these cases apparently an 

 hereditary trait. — C. H. Danforlh. 



1526. Holmberg, O. R. Carex dioicaXpaniculata, en for Skandinavien ny hybrid. (Carex 

 dioicaXpaniculata, a hybrid new for Scandinavia.] Bot. Notiser 1918: 249-252. 8 fig. 1918. 



1527. Honing, J. A. Selectie-proeven med Deli-tabak. II. [Selection experiments with 

 Deli-tobacco. II.] Meded. Deli-Proefstation, Medan, Sumatra, 2: 84. 1 pi. 1918. — Gives 

 results of selection experiments at Deli Proefstation for 1917. The tobacco was harvested 

 separately, tied in bundles with specially colored twine, fermented in bulk with the other 

 tobacco, and finally separated for testing. In general the results of 1917 were inferior to those 

 of 1916 due to less favorable weather. Both large- and small-scale trials were made. In 

 the small-scale trials there were 467 lots, most of these containing 800-1200 plants. These 

 repres ented 150 seed-numbers belonging to 81 lines. Of the large-scale trials, with from 

 90,000' to 560,000 plants per lot, there were 34. These trials were distributed over 17 estates 

 and were supervised by 5 assistants. Figures for production, percentages of various qualities, 

 estates' grading and manufacturers' grading, leaf measurements, numbers ot leaves per plant, 

 burning tests, etc., are given for most of these lines. The writer does not agree with Koch 

 (Koen, L. Algem. 1528 Landbouwincekblad voor Med. India, Dec. 7, 1917) that mixed seed 

 is to be preferred to that from pure lines, so far as tobacco culture is concerned. [See also 

 next following Entry, 1528.] — Carl D. La Rue. 



1528. Hoxixg, J. A. Selection experiments with Deli tobacco. III. Meded. Deli-Proef- 

 stat. Medan 2: 25. 1919. — See also next preceding Entry, 1527. 



