912 



SCIENCE 



[N. S, Vol. XLII. Mo. 1095 



ity; the various deviations from simple Men- 

 delian proportions, hypostasis and latency, 

 sterility and inbreeding. The author also 

 treats of coupling and " repulsion " without 

 being able to make use of the flood of light 

 that Morgan and his pupils have thrown upon 

 these ideas. Indeed, Johannsen at the time of 

 writing the book was not inclined to ascribe to 

 the chromosomes the importance in heredity 

 that is commonly conceded to them in this 

 country. 



In his final chapter Johannsen considers cer- 

 tain relations of the results of heredity to man 

 and to evolution. He thinks the fact that cul- 

 ture (euthenics) has no effect on the race 

 makes it not less but the more significant ; for 

 the momentary position of the race is the sum- 

 mation of personal qualities. In a sense it is 

 true that the worse the breeding the greater 

 the need for cultivation if any sort of a crop 

 is to be harvested. As for the bearing of the 

 new facts of heredity on evolution Johannsen 

 has little to say and he states that we miss to- 

 day the genius of a Darwin to establish a 

 theory of evolution in harmony with modern 

 knowledge. 



C. B. Da^^nport 



Einfuhrung in die Tierpsychologie. Erster 

 Band, Die Sinne der Wirbellosen. Von 

 GusTAv Kafka. J. A. Earth, Leipzig. Pp. 

 xii -f- 593. 8vo. 362 text illustrations. 

 Animal psychology, according to Kafka, 

 takes its departure from the same body of facts 

 that sensory physiology does, but differs from 

 this subject in the problems it sets itself for 

 solution. That most of these problems are 

 still imsolved justified the author in his opin- 

 ion that a good text -book on animal psychol- 

 ogy should concern itself with the facts of 

 animal reactions rather than with theoretic 

 matter. The book holds consistently to this 

 view. It contains, after a very brief introduc- 

 tion, an account of the rapidly accumulating 

 material on the sense of touch, the static sense, 

 the sense of hearing, the temperature sense, 

 the chemical sense, the light sense, and the 

 very questionable senses of space and of time, 

 all in invertebrates. The volume is well illus- 



trated and is concluded by a bibliography of 

 over five hundred titles in a well-ordered ar- 

 rangement. As an introduction to the newly 

 discovered facts in animal reactions the vol- 

 ume is in every way serviceable, though from 

 the rate at which the subject is growing the 

 book is bound soon to fall behind the times. 

 As a means of quickening in the student a 

 sense of the general problems in this field of 

 research, it is disappointing. This fault may 

 be excused on the grounds that it is just this 

 side of the subject that the author has inten- 

 tionally avoided, but it is an open question 

 whether this avoidance is really a virtue. 

 While the volume from its clearness and direct- 

 ness of statement will be found of much use 

 to the student of animal psychology and allied 

 subjects, its failure to deal with the more obvi- 

 ous general problems of this field of science 

 must be regarded as a real defect. Possibly 

 this may be remedied in the companion volume 

 on the vertebrate senses which is said to be in 

 preparation by the same author. 



G. H. Parker 



SPECIAL ABTICLES 



HEREDITY AND INTERNAL SECRETION IN THE 



SPONTANEOUS DEVELOPMENT OP 



CANCER IN MICE 



After preliminary studies in 1901 and 1902, 

 and subsequent observations in 1907 suggesting 

 the significance of heredity in the spontaneous 

 development of cancer in rats and mice, we 

 undertook an analysis of the hereditary factors 

 on a larger scale in 1910 in conjunction with 

 Miss A. E. C. Lathrop in Granby, Mass.^ 



iLoeb, L., Medicine, 1900, VI., 286; Centralbl 

 f. Bakteriol., I., Abt., Orig., 1904, XXXVII., 235 

 Univ. Penn. Med. Bull, 1907-08, XX., 2; Cen- 

 tralUatt. f. allg. Pathol., 1911, XXII., 993 

 Lathrop, A. E. C, and Loeb, L., Proc. Soc. Exp. 

 Biol, and Med., 1913, XI., 34. Loeb, L., Lancet- 

 Clinic, 1913, ex., 664. Lathrop, A. E. C, and 

 Loeb, L., Journal Exp. Med., XXII., Nov., 1915, 

 646, and Dee., 1915, 713. The credit for the first 

 investigations on a somewhat larger scale into the 

 possible influence of heredity on the tumor inci- 

 dence in mice belongs to E. E. Tyzzer (Jour. Med. 

 Besearcii, 1907-08, XVII., 155). The procedure 



