ANIMAL PRODUCTION, 377 



The management and feeding of cattle, T. Shaw {New York and London, 

 1909, pp. XXXI+461, pi. 1, figs. 25).— In this book, written for tlie practical 

 feeder, the author's aim has been to cover the entire ground relating to the 

 feeding and management of cattle from birth to maturity. There are also 

 chapters on the special topics of finishing beef cattle, baby beef, marketing, 

 growing and fitting for exhibition, stabling, dehorning spaying and castrating, 

 diseases, and injurious insects. 



Live stock: Breeding and management, P. McConnell {London and Islew 

 York, pp. 112, pi. 1, figs. 15). — This contains a short description of the principles 

 and methods of live stock farming, of each breed worthy of note, and of the 

 directions in which further improvement may be expected. 



The biologist's part in practical plant and animal breeding, J. W. Harsh- 

 BERGER {Amcr. Vet. Rev., 35 (1909), Xo. 3, pp. 25.'i-265.) — A paper read before 

 the Pennsylvania Veterinary Medical Association, March. 1909, in which are 

 discussed line-breeding, in-breeding, crossing, and the deleruiination of sex. 



The author reviews the great service which biologists like Darwin, Mendel, 

 De Yries, and Marchals, have rendered to the practical l)reeder. jind states that 

 " the practical plant and animal breeder can not neglect to encourage the biolo- 

 gist in his pursuit of pure scientific investigation, ln'cause some of the ap- 

 parently least practical research work may prove ultimately to be of the 

 highest practical value." 



A study of inheritance in mice with reference to their susceptibility 

 to transplantable tumors, E. E. Tyzzer (Jour. Med. Researeh, 21 (1909), Ao. 

 3, pp. 519-513, figs. 2). — This investigation was undertaken in order to deter- 

 mine if the suscei)tibility to an inoculable tumor is transmitted in accordance 

 with Mendel's law. The results show that the successful transplantation of 

 tumor tissue in mice is dependent ui)on three main factors — the method of 

 inoculation, the character of the individual tumor employed, and the nature of 

 the tissue upon which the tumor is implanted. The three factors are subject to 

 great variation as well as other subsidiary conditions. 



A tumor which originated in ii Japanese waltzing mouse was transplanted 

 for many generjitions in mice of the Siime variety, hut invariably failed to grow 

 when inoculated into common mice. Attempts to inoculate Japanese waltzing 

 mice with the Jensen tumor were unsuccessful, and the Ehrlich " Stamme II " 

 tumor in this variety developed more slowly and in fewer cases than in com- 

 mon mice. 



The hybrids of the first generation of a cross between common albinos and 

 the Japanese waltzing mice were found to be slightly more susceptible than the 

 latter but less susceptible than common mice. The Japanese waltzing mouse 

 tumor, on the other hand, grew more readily in these hybrids than in Japanese 

 waltzing mice. The offspring of such hybrids were found, however, to be ab- 

 solutely insusceptible to this tumor, as were mice of the third filial generation. 



" Susceptibilty to an inocular tumor is neither, therefore, inherited in accord- 

 ance with Mendel's law, nor are the results obtained from cross-breeding ex- 

 plained by any other known principle of inheritance. 



" There is no correlation between any of the visible racial character and 

 susceptibility to the inoculable tumors employed . . . It is found that the 

 size of !in animal does not influence the rate of growth of a tumor, except 

 possibly in its late development. Tumors grow most raj)idly in young animals 

 in which body growth is greatest. 



" It is possible that results of another sort may attend the cross-breeding 

 of other varieties or breeds of mice, but from the data at hand it is apparent 

 that the factor of race or, better, of blood relationship, is of considerable im- 

 portance in the investigation of transplantable tumors." 



