W. L. TOWER 



PLATE 29 



Classes 23 22 21 20 19 18 17 16 15 14 13 12 II 10 9 8 7 G 5 4 3 2 I a b. c d e. f g. h. 



DIAGRAMMATIC REPRESENTATION OF THE RESULTS OBTAINED IN THE ATTEMPT TO 



CREATE ALBINIC AND MELANIC RACES BY THE COMBINED INFLUENCE 



OF SELECTIVE AND ENVIRONMENTAL STIMULI 



