272 EXPERIMENT STATION RECORD. 



feeds used in this experiment wore: 70 cts. jxt l)nsliel for corn, with an addi- 

 tion of 10 cts. per hnndrod j)onn(ls for jirindni};; 25 cts. per hundred pounds for 

 slviui milk; juid $80 per Ion loi- Ixitli linseed and soy bean meals. 



Three lots of 10 ho^s eaeli were fed .'>0 days to eoni]):ire shelled corn, shelled 

 corn and lankase. and shelled corn and buttermilk for fatteniuf? liof?s, weighing 

 about L'<M» lbs. at the beginning of the oxiieriment. On the shelled corn ration 

 the average daily gain was 1.40 lbs. jier head at a cost of 4.74 cts. per pound; 

 on the shelled corn and tankage ration 1.73 lbs. i)er head at a cost of 4.25 cts. 

 per pound; and on liie shelled corn and buttermilk 2.20 lbs. per head at a cost 

 of 4.09 cts. per pound. The tanlcage was estimated at $2 and the buttermilk 

 at 20 cts. per hundredweight and the corn at 60 cts. per bushel. If the corn had 

 been estimated at 40 cts. i)er bushel there would have been little difference in 

 the costs of gains in the difCei'ent lots. 



The development of the chicli, F. R. Lillie (Neio York, 1908, pp. Xl+Jt12, 

 pis. 7, //f/.s'. 2'il). — This book is intended as a text-book for the study of the 

 embryology and development of the chick, and at the same time serve as an 

 introduction to the study of embryology in general. 



The introduction contains a resume of the cell theory and the general char- 

 acter of the ovum and spermatozoon. Part 1 treats of the anatomy and physi- 

 ology of tlie ovary, the structure and chemical composition of the egg, and the 

 changes in the egg during the tirst 3 days of incubation. The matter concern- 

 ing the later development is classitied by the organs concerned and constitutes 

 part 2. 



Experimental biology, H. Przibbam {VerJiaudJ. K. K. Zaol. Hot. (Icsell. 

 Wien, 58 (HJ08), Xo. 0-7, pp. (.171)-{180) ; abs. in Jour. Roy. Micros. 8oc. 

 [London], 1909, No. J, p. 563). — This is a lecture in which many interesting 

 cases are cited to show the value of experimental methods in studying the 

 fundamental principles of plant and animal life. 



The development of the animal egg by means of chemical stimuli, J. 

 LoEB (Die (lictniscJic EnttcickJungscrr( giiiitj des TicriscJicii Eics {Kilnstliche 

 Parthenogciicsc). Berlin, 1909, pp. XXIV+259, figs. 56; rev. in Aatiire [Lon- 

 don], 81 {1909), No. 2085, p. 1(59). — This is an attempt to interpret the process 

 of fertilization of the ovum in terms of chemistry and physics, and is based 

 largely on the researches of the author. 



The introduction contains a concise resume of investigations in artificial 

 parthenogenesis. The development of the egg is considered to be a chemical 

 process depending mainly on oxidation, in which there is a synthesis of nuclear 

 material from the cytoplasm. The formation of the membrane is regarded as 

 the most important factor of fertilization. It has also a deleterious effect 

 which must be counteracted in some way. In natural fertilization of the egg 

 the formation of the membrane is brought about by a lysiu carried by the 

 spermatozoon, which also brings a second substance which serves to counteract 

 the evil effects of membrane formation. 



Note on the chemical mechanics of cell division, T. B. Robertson (Aj'c/i. 

 Entwickl. Mcch. Organ., 21 (1909), No. 1, pp. 29-3^).— The author points out 

 that cell division can not be brought about through an increase of surface 

 tension at the equator, as suggested by Biitschli, as an increase of surface ten- 

 sion at that point would induce a streaming of material toward the equator 

 and the formation of a flattened disk instead of cellular division. 



Further conclusions of the author are as follows: 



"If a thread moistened with a base, or a sufficiently concentrated solution 

 of the base, be laid across a diameter of a drop of oil containing a trace of 

 fatty acid, the drop undergoes division along that diameter. 



