No. 2, March, 1921] GENETICS 123 



portions of it become detached from the eye." These white spots may occur in any of sev- 

 eral positions on the head and first body segment. Spots have occurred in all the experi- 

 mental stocks, but seem to run in particular families; they are most frequent in albino stock 

 and frequent in red, heterozygous for albino. "The spots appeared almost simultaneously 

 in our different stocks." The authors present briefly a considerable number of data involving 

 many individual matings, from many of which 300 or more young were obtained. Authors 

 conclude that "the inheritance of spots did not follow the simple Mendelian law. The 

 spotted condition did not behave either as a pure dominant or a pure recessive. Spotted 

 animals mated together always gave both spotted and unspotted offspring. One point, how- 

 ever, came out clearly, namely, that albino and coloured strains carrying albino gave a much 

 larger percentage of spotted young than do pure coloured strains. There is a possibility that 

 the inheritance of spots follows some complicated Mendelian law The Mende- 

 lian ratios 3:1, 9:7, 15:1 frequently occur in some of the best cases we have, where figures are 

 large, but it is hard to find a consistent theorj'." — This study, parts of which have been set 

 forth in earlier papers, probably represents the first Mendelian analysis of hereditary char- 

 acters in Crustacea. — A. M. Banta. 



841. Alverdes, Friedrich. Uber das Manifestwerden der vererbten Anlage einer 

 Abnormitat. [On the manifestation of the hereditary factor of an abnormality.] Biol. Zen- 

 tralbl. 40: 473-480. Oct., 1920. 



842. Anonymous. British cytology. [Rev. of: Doncaster, L. An introduction to the 

 study of cytology. XIV + 280 p., 2^ pL, 31 fig. Cambridge University Press: Cambridge, 

 England. 1920.] Nature 105: 190-191. 1920. 



843. Anonymous. Rapid Cyclamen culture and raising hybrids. Florists' Exch. SO: 

 1070. Nov. 20, 1920. — Suggestions on Cyclamen culture and possibilities of hybridization 

 between different species and related genera, such as Dodecatheon. Greenhouse Cyclamen 

 originated from C. persicum and C. laciniatum, the latter contributing the fringe types. — 

 Orland E. White. 



844. Anonymous. Scottish station for research in plant breeding. Pharm. Jour. 103: 

 191. 1919. — By private subscription, supplemented by government funds, money is being 

 accumulated for the founding of the above-named institute. It is hoped that part of the 

 work of the station will result in the introduction of improved agricultural varieties of plants 

 such as will help in solving problems of food production and of rural employment. In 

 developing the station Scotland is keeping abreast of England and Wales where provision is 

 being made for botanical research under similar conditions. — Wilber Brotherton, Jr. 



845. Anonymous. The progress of genetical research. Card. Chron. 68: 175. Oct. 9, 

 1920. — Editorial comment and partial review of Miss Saunder's presidential address to the 

 Botanical Section of the British Association. Notes increasing complexity of Mendelian 

 phenomena. Some plant characters are expression of a single factor, while others depend on 

 simultaneous presence of several factors. Hairiness in Lychnis vespertina depends on one 

 factor. Hairy X glabra gives hairj^ in Fi and 3 hairj^: 1 glabra in F2. In stocks, Saunders 

 has shown hairiness depends on presence of four factors, the absence of any one of these 

 giving glabrous plants. Ligules on oats due to four or five factors, the presence of any one 

 of which gives rise to ligule. Heribert-Nilsson shows specific or species characters are not 

 exempt from Mendelian law. In Salix (willows) those characters regarded by systematists 

 as of specific value depend on normal-acting Mendelian factors. Specific-character factors 

 more general in effect on plant structure than varietal-character factors. Former, unlike 

 latter, may affect many or all parts of plant, thus bringing about striking peculiarities in gen- 

 eral appearance of plant. These facts may throw light on why some species, outwardly very 

 distinct, are easily crossed with each other, while others, to the eye much more nearly alike, 

 give no results when crossed together. Suggests that apparently wide differences between 

 species in some cases may be due to relatively few factor differences. Comments on Greg- 



