274 EXPEEIMENT STATIOIST EECOKD. 



the former was corn meal and wheat bran and for the latter corn meal 

 only. . . . 



" Lime furnished by oyster shells did not supply the deficiency of ash in some 

 of the rations, as all pens had oyster shells available at all times." 



[Poultry experiments], W. P. Brooks, E. S. Fulton, and E. F. Gaskill 

 (Massachusetts Sta. Rpt. 1909, pt. 1, pp. 4'h -{5)- — The moist mash system of 

 feeding poultry was continued during the year, and in 4 out of 6 experiments 

 proved to be superior to the dry feed. Averaging the results of 3 experiments 

 in summer and 3 in winter, the number of eggs laid daily per 100 hens was 36.3 

 eggs on the moist mash and 34.5 eggs on the dry ration. 



Poultry raising-, W. E. Yaplon (Colorado Sta. Bui. 16-'f, pp. 3-14). — This is 

 a bulletin of information relative to the conditions for successful poultry rais- 

 ing in Colorado, and is the result of a study of methods practiced among expert 

 poultrymen of the State. The chief topics are location of the poultry farm, 

 breed.s, feeding, incubation, marketing, records and accounts, and poultry 

 buildings. 



Productive qualities of fowls, J. Dryden (Oregon Sta. Circ. 10, pp. 16). — 

 A lecture given at the poultry section of the Graduate School of Agriculture, 

 1910, which discusses the characters desirable in fowls kept for egg production. 

 The American Standard of Perfection is criticised, as it does not consider egg 

 yield in its scale of points. 



Biology, C. Letoukneau (La Biologic. Paris [1910], pp. XI +506, figs. 113). — 

 This is a book on general biology and treats of the chemical constitution of 

 living matter, the physiology of the cell, motility, nutrition, assimilation, growth, 

 generation, innervation, and the physical forces involved in the life of both 

 plants and animals. 



The biological writings of Samuel Butler and their relation to contem- 

 porary and subsequent biological thought, M. Hartog (Sci. Prog. TivcntietJi 

 Cent., 5 (1010), No. 11, pp. 15-31). — Besides a review of Butler's works there 

 are extended notices of recent writings on heredity by Semon, Jennings, Driesch, 

 and other investigators. The author draws the inference that in recent years 

 there has been a growing tendency to accept some form of the memory theory 

 of heredity because at present the problem of heredity can only be elucidated 

 by the light of mental and not material jirocesses. 



The geometrical relation of the nuclei in an invaginating gastrula (e. g. 

 Amphioxus) considered in connection with cell rhythm, and Driesch's concep- 

 tion of entelechy, R. Assheton (Arch. Enttcickl. Mcch. Organ., 29 (WIO), 

 No. 1, pp. 46-18, figs. 9). — After a review of recent investigations on the 

 mechanics of the invagination process, the author concludes that cell division 

 can not be explained on purely physical and chemical grounds, but states that 

 if we are to have. a vitalistic theory instead of a mystical conception, it must 

 be based on some principle which can be studied by mathematical methods. 



" If we regard cell division in a general way, apart from the details of the 

 process, we are led to conclude that there is an evolution of some form of 

 energy within the cell which may very well be peculiar to living matter, show- 

 ing, or appearing to show, alternately unipolar and bipolar states, the latter 

 in most cases resulting in the complete separation of the portions of pro- 

 toplasm dominated respectively by either pole. It is not inconceivable that 

 although the two poles within the cell repel one another, yet in the real or 

 apparent unipolar state one cell as a whole may attract another cell.'' 



Chromosomes and heredity, T. H. Morgan (Amer. Nat., 44 (1910), No. .524, 

 pp. 449-496, fig. 1). — After weighing the evidence afforded by recent investiga- 

 tions on the function of the chromosome the following conclusions are reached : 



" The essential process in the formation of the two kinds of gametes of 



