No. 3, October, 1921] GENETICS 207 



biuing vigor, or constitution, with other desirable characters, such as texture, size, color, and 

 aroma. ''It seems to be the fact that, in general, plants inherit type and constitution more 

 largely from the mother than from the pollen parent." This conclusion is based on exten- 

 sive work with strawberries. In practice the aim "is to get the individual which combines 

 in fullest measure the constitution of one parent and the finer qualities of the other." In 

 general these 2 qualities are not usually found united in the same individual. The author 

 has evidence which suggests the desirability of using the higher quality plant as the ovule 

 parent and the robust one as pollen parent since it is probable that "by this method it is possi- 

 ble to eliminate a very much larger percentage of seedlings in the first two or three years." 

 On the other hand, if a robust plant is used as mother, a larger percentage of seedlings of 

 robust constitution is obtained, which require years of time in testing. This method is sug- 

 gested in hybridizing roses and fruits where hardiness is a desirable factor. — Regarding the 

 inheritance of disease resistance, the generally accepted belief is noted that the difference in 

 virulence of different strains of organisms may be equal to or greater than the difference in 

 resistance of the cultivated plants; but the possibility is suggested of incorporating disease 

 resistance of some varieties, in which it is general, into other varieties in which it is absent. 

 The author also suggests the substitution of the word "isolation" for the commonly used 

 term "selection," because the former term more nearly describes what is really practiced in 

 improvement work. [See also Bot. Absts. 6, Entry 115.] — C E. Myers. 



1317. Curtis, Robert S. The fundamentals of livestock judging and selection. 14 X 

 20.5 cm., 464- P; 190 fig. Lea & Febiger: Philadelphia, 1920. — A text-book of livestock judg- 

 ing; first edition appeared in 1915. — Seivall Wright. 



1318. Cutting, E. M. Heterothallism and similar phenomena. New Phytol. 20: 10-16. 

 1921. — The author reviews a number of papers pertinent to the subject of heterothallism, 

 notably those of Blakeslee, Burgeff, Atkinson, Gruber, and Burger, on various Mucor- 

 ine^fungi. Similar phenomena observed by Clinton and by Murphy in Phytophthora spp., 

 by FiTZPATRiCK in Eocronartium, by Kniep and Bensuade in various Basidiomycetes; by 

 Edqerton in Glomerella; and by Taubenhaus in Sclerotium Rolfsii are mentioned and 

 discussed. — Charles Drechsler. 



1319. Czuber, E. tJber Funktionen voa Variablen, zwischen welchen Korrelationen 

 bestehen. [Functions of variables between which correlations exist.] Metron 1: 53-61. 1920. 

 — The author extends Pearson's formulae for the mean and standard deviation of an index 

 to the general case, expressing the mean and standard deviation of any function in terms of 

 the means, standard deviations and coefficients of correlation of its arguments. 



If F=/(Xi, Xj, . . .Z») 



N 



M = --EiV)=f+h [fnCTi' + fz2a^■' + . . . +/„«o-„»] 



where / = / (Mi, M^, . . . M„), Mi being the mean of Xi, etc. 



-'1 sr^> h = 



dll/l' ' bM; 



> ' 





o-.» = /iVi2 +/2=crj2 4. _ . +/nV„« + 2fif.,(Ti<Jirn + 2/1/30- iCTsru + . . . 

 + 2f2fi(T2(Tir2i. — John Rice Miner. 



1320. Dehorne, Lucienne. Hermaphroditisme et scissiparite. [Hermaphroditism and 

 schizogenesis.] Compt. Rend. Acad. Sci. Paris 169: 1110-1112. 1919. — It has long been known 



