between areas of origin of the salmon 

 tested. 



k. An hypothesis to explain the possible 

 genetic determination of these differ- 

 ences was presented and tested with 

 the Hardy-Weinberg law. 



LITERATURE CITED 



RIDGWAY, G. J. , AND G. W. KLONTZ 



1957- Manuscript in preparation. 



SNEDECOR, G. W. 



1956. Statistical methods. 5th Ed. 

 The Iowa State College Press,. 

 Ames, Iowa. 



SRB, A. M., AND R. D. OWEN 



1953- General genetics. W. H. Free- 

 man & Co., San Francisco. 



CUSRTNG, J. E. 



195b. Observations on serology of 



tuna. U.S. Fish and Wildlife 

 Service, Special Scientific 

 Report — Fisheries No. I83. 

 14 pp. 



CUSHTNG, J. E., AND D. H. CAMPBELL 

 1957- Principles of immunology. 

 McGraw-Hill, New York. 



CUSHTNG, J. E. , AND G. L. DURALL 



1957- Isoagglutination in fish. Amer. 

 Nat.. 91 : pp. 121-126. 



CUSHTNG, J. E. , AND L. SPRAGUE 



1953- Agglutinations of the erythro- 

 cytes of various fishes by 

 human and other sera. Amer. 

 Nat. 87: pp. 307-315- 



HALDANE, J. B. S. 



1952. Simple tests of bimodality and 

 bitangentiality. Ann. 

 Eugenics 16, pp. 359-364. 



HILDEMAN, W. H. 



1956. Goldfish erythrocyte antigens 

 and serology. Science 124, 

 pp. 315-316'. 



RACE, R. R. , AND R. SANGER 



1954. Blood groups in man. 2nd Ed. 

 CC. Thomas, Springfield, 111. 

 Publ. 



SUYEHIRO, YASUO 



I949. On the agglutination of the 

 bloods of fishes. Bull. 

 Physiograph. Sci. Res. Inst. 

 Tokyo Univ. 2, pp. 42-50. (in 

 Japanese). 



ADDENDUM 



Since the preparation of this manu- 

 script we have tested somewhat larger 

 samples from Bristol Bay and the Columbia 

 River, taken in the 1957 season, and have 

 repeated the distinction with considerable 

 precision. In 1956, 86 percent of Bristol 

 Bay sockeye salmon tested had scores less 

 than 3-5 while 63 percent of those from 

 the Columbia River had scores greater than 

 3.5. In 1957, 92 percent of the Bristol 

 Bay fish tested had scores less than 3-5 

 while 79 percent of those from the Columbia 

 River had scores greater than 3- 5- This 

 year to year stability provides further 

 evidence for the genetic control of the 

 characters determined by this method. 



RACE, R. R. , R. SANGER, AND D. DELANE 

 1953- Quantitative aspects of the 



blood-group antigen fya. Ann. 

 Eugenics 17, pp. 255-2o6. 



RIDGWAY, G. J. 



1957> The use of immunological tech- 

 niques in racial studies. U.S. 

 Fish & Wildlife Service, Special 

 Scientific Report—Fisheries 

 No. 208, pp. 39-^3- 



