ANIMAL PRODUCTION. 671 



character may not appear hut when two parents together produce the required 

 factors the conibinatiou may be an apparently new. comi)ound character: which 

 we tind elsewhere only in remote ancestry." 



Germinal analysis through hybridization, C H. Shttll {Proc. Amrr. rhil. 

 kioc, 'i<> < imO), yo. lUr>. i>iK 2Sl-'.>V<i).—X critical discussion of the signiticance 

 of Meudelian phenomena. The author holds that the question of epigenesis 

 versus preformation, as a fundamental difference between Riddle's views 

 (E. S. R.. 21, p. 374) and those of the Mendelians, is largely imaginary, and 

 that Spillmau (E. S, R., 23. p. 172) by proposing the term "teleone" does not 

 dispose of unit characters but merely changes the terminology. 



"The unit characters are real things capable of repeated demonstration. 

 They are still differential characters, and possess the capacity to behave as 

 units, entering into various combinations with other unit characters and capable 

 of reextractiou from them, or of being absent altogether, regardless of the 

 manner in which their behavior is explained. The genes, on the other hand — 

 the ultimate organs of the protoplasm or conditions of the protoplasmic sub- 

 stance tipon whose existence depends the capacity to give certain series of reac- 

 tions, or to pass through certain cycles of ontogenetic development — are purely 

 inferential. . . . 



" The most hopeful directions of approach in the effort to learn more of the 

 true inwardness of the unit characters, are those of chemical analysis and 

 experimental cytology. . . . While waiting for further information from the 

 chemist and the cytologist, there is still abundant room for the work of the 

 experimental breeder." 



Cell division as a bipolar phenomenon of an electro-colloidal character, 

 A. (Jallardo {A)Th. Eutirirkl. Mcch. Organ., 2S (1909), Xo. 1, pp. 12^-131), 

 figs. 9). — To sustain his views the author assumes a negative electro-colloidal 

 charge for the chromatin and a positive one for the cytoplasm and centrosomes. 

 A resume is given of similar views that have been suggested by other 

 investigators. 



A bibliography of the subject is appended. 



The plumage of crosses between guinea fowls, M. F. Gxtyer (Bui. Mus. Nat. 

 Hist. Xat. [Puris], 1909, No. 1, pp. 3-6, pi. 1) . — A hybrid, now in the museum of 

 natural history in Paris, is illustrated and described. 



The specimen in question resembles the domestic fowl more than the guinea. 

 The plumage of this and other specimens which the author studied are sometimes 

 atavistic, showing alternate light and dark chevrons, which is characteristic 

 of Polpplcctron chalcurnH and Affcla.stes mclcagrides. The author suggests that 

 these markings may have constituted the primitive plumage of the pheasant 

 family. 



A new zebra hybrid, E. H. Riley (Amrr. Breeder.^ Mag., 1 (1910), No. 2, 

 pp. 101-110, figs. .]). — An account of the work of the Bureau of Animal Industry 

 of this Department in producing hybrids with tlu' ass and Grevy zebra (Equus 

 grevyi). 



On the recognition of the individual by hemolytic methods, C. Todd and 

 R. G. AVhiti; [I'roc Hog. Soc. [London], Sri: B, S2 (1910), No. B .7.57. /)/). .'//6'- 

 J,21). — "The immunization of the ox with the red blood corpuscles of other 

 oxen gives rise to the formation of a hemolytic amboceptor in the blootl of the 

 immunized animals. The amboceptor so formed is an isolysin but not an auto- 

 lysin. The race of the animal appears to have vei-j' little influence on the 

 resulting hemolysins. The serum of an aniuial so treated acts very differently 

 on the red blood corpuscles of different individiial oxen. Tlie sera of different 

 individuals similarly immunize<l differ from one another in their action on the 

 corpuscles of different individuals.' . . . The red blood corpuscles of any indi- 

 03100°— Xo. 7—10 G 



