ANIMAL PRODUCTION. 771 



The metabolic balance sheet of the individual tissues. Final report of the 

 committee, F. Gotch et al. {lipt. Brit. As.s(h: Adv. aS'c/.. 1<)08, pp. Jt36-.'tJ,0) .— 

 The principal object of the committee was the establishment of methods for 

 research and it is stated that this end has l)een attained. 



A summary is presened of the work reported durinji the last 5 years as re- 

 gards technique and the results obtained in experiments with individual organs. 



Further advances in physiology. L. Hill (London, I<K)!l. pp. yi-\-J,JfO, figs. 

 50). — This volume is mainly devoted to the consideration of certain problems 

 concerning circulation and resi)iration, the neuromuscular system, and vision, 

 and includes the following paiiers: The Equilibrium of Colloid and Crystalloid 

 in Living Cells, by B. Moore ; The Heart, by M. Flack ; Pulse Records in Their 

 Relation to the Events of the Human Cardiac Cycle, by T. Lewis; The Vas- 

 cular System and Blood Pressure, by L. Hill ; The Mechanism of Respiration 

 in Man, by A. Keith: The Physiology of Muscular Work, by M. S. Pembrey; 

 Some Chapters on the Physiology of Nerve, by N. H. Alcock ; Recent Itesearches 

 on Cortical Localization and on the Functions of the Cerebrum, by J. S. 

 Bolton ; and Studies in Special Sense Physiology, by M. Greenwood, jr. 



ANIMAL PRODUCTION. 



Experimental zoology. I, Embryogeny, H. Przibram (Cambridge, Eng., 

 J 90S, pp. VIII+12-i, pis. 16). — This is the first of a series of 5 books which are 

 to treat of the fundamental problems of the animal organism. The present 

 volume is a review of recent investigations on the structure of the egg, fertiliza- 

 tion, cleavage, and influence of external factors on the development of the egg 

 in its early stages without reference to its origin. The results are summarized 

 as " laws governing the development of the animal egg as ascertained through 

 experiments." 



An extensive bibliography is appended. 



Elements of the exact study of heredity, W. Johannsen (Elemente der 

 exakten Erblichkeitslehre. Jena, 1909, pp. VI +516, figs. 31; rev. in Nature 

 [London], SI (1909), No. 208Jf, p. Jf2Ji). — ^A translation of a new and enlarged 

 edition of a Danish book first published in 1905, in which are discussed the 

 facts of variation and its statistical study. The author, who is a mutationist, 

 describes his theory of " pure lines " at length. Selection is considered by 

 him to have but little influence in the production of new races. New charac- 

 ters are brought about by crossing and can be propagated in accordance with 

 Mendel's law. 



The theory of ancestral contributions in heredity, K. Pearson (Proc. Roy. 

 Soc. [London], Scr. B, SI (1909), No. B 5',7, pp. 2 19-22. 'i).— This paper was 

 written to show that ancestral influence can not be denied in the case of any 

 population mating at random and inheriting on Mendelian lines. In cases 

 which have been cited by other observers to the contrary attention is confined 

 to isolated lines of inheritance with restricted matings or it is asserted that 

 a gametic knowledge of parents was equivalent to a gametic knowledge of 

 ancestry. 



On the ancestral gametic correlations of a Mendelian population mating 

 at random, K. Pearson (I'ror. Roy. Soc. [London], Ser. B, 81 (1909), No. 

 B 5.'i7. ])p. 225-229). — This is an investigation of the correlation of the gametic 

 characters in a general population. The fornnilio of different matings are 

 given, which show the effect of individuals of each special tyi)e mating with a 

 general population. By obtaining the array of offspring due to any known 

 ancestry the general law of distribution is reached, which demonstrates that 

 1.5149— No. S— 09 G 



