300 The Journal of Heredity 



able, as Webber has suggested, to use ties of root stocks would undoubtedly 

 only large, vigorous stocks for grafting result in more uniform and, in general, 

 or budding. The use of clonal varie- more productive trees. 



I.rrKKATlKE CiTHD 



a. Cuniniings, M. B. 



1921. Apple cion selection from high and low \iel(lint( parent trees. /;; \'t. .■Xgr. Exp. 

 Sta. Bull. 221, p. 36-38. 



b. Harris, J. A. 



1913. On the calculation of intra-class and inter-class coefficients of correlation from 

 class moments when the number of possible combinations is large. In Biometrika, v. 

 9, p. 446-472. 



c. Hatton, R. G. 



1920. Suggestions for the right selection of apple stocks. lu [our. Ro\-. Hort. Soc. v. 

 45, p. 257-268. 



d. Macoun, W. T. 



1916. The apple inCanada, its cultivation and improvement. In Dominion Exp. Farms 

 Bull. 86, p. 27-31. 



e. Shamel, A. D., Scott, L. B., and Pomeroy, C. S. 



1918. Citrus-fruit improvement: A study of bud variation in the Washington Naval 

 orange. U. S. Dept. Agr. Bull. 623, p. 1-146. 



f. Shamel, A. D., Scott, L. B., and Pomeroy, C. S. 



1918. Citrus-fruit improvement: A study of bud variation in the Valencia orange. 

 U. S. Dept. Agr. Bull. 624, p. 1-120. 



g. Shamel, A. D., Scott, L. B., and Pomeroy, C. S., and Dyer, C. L. 



1920. Citrus-fruit improvement: A study of bud variation in the Lisbon lemon. 



U. S. Dept. Agr. Bull. 815, p. 1-70. 

 h. Shamel, A. D., Scott, L. B., and Pomeroy, C. S. 



1920. Citrus-fruit improvement: A study of bud variation in the Flureka lemon. 



U. S. Dept. Agr. Bull. 813, p. 1-88. 

 i. Webber, H. J. 



1920. Selection of stocks in citrus propagation. Calif. Agr. Exp. Sta. Bull. 317, p. 



269-301. 

 j. Webber, H. J. 



1920. The improvement of root-stocks. In Jour, of Heredity, v. 11, no. 7, p. 291-299. 

 k. Whitten, J. C. 



1915. Bud selection for increasing yields. In Mo. Agr. Exp. Sta. Bull. 131, p. 479-480. 



Mental Hygiene 



Manual of Psychiatry, edited by free from syphilitic infection, is not 

 Aaron J. Rosanofif. Fifth ed.; re- seriously threatened with a mental 

 vised and enlarged. New York, cli^^order. But since alcoholism aiid 

 T u AA-1 PC im,^. ^oi syphilis are, in their turn, so generally 

 John W iley & Sons, 1920, pp. 684. connected either directly or indirectly 

 The manual is comprehensive. Al- with inherent mental defectiveness, it 

 though based on Kraepelin's classifica- follows that heredity is, as long taught 

 tion, it finds room for I^Veud and 150 with characteristic clearness of thought 

 pages or more of mental tests. As to and diction by the French school of 

 why one "goes insane," "The situation psychiatry, the cause of causes of men- 

 may be summarized as follows: at tal disorders." It is further indicated 

 least three-fourths of all cases of mental that "most of the inheritable mental 

 disorders occur on the basis of bad disorders, are, like the trait of blue 

 heredity, alcoholism, drug addictions, eyes, transmitted in the manner of 

 or syphilis; an individual who is of Mendelian recessives," the publications 

 normal ancestry, abstains from alcohol of the Eugenics Record Office being 

 and habit-forming drugs, and remains cited to support this. — P.P. 



