EDITORIAL STATEMENT! 



Seven manuscripts bearing ,, n the subject of tliis volume, nearly 2,(MM) pages 

 of breeding record, ami about 200 illustrations uith accompanyinj 



prised the material from whicli the present volume 



The first of these manuscripts was written in L897. It treats of inl.criian,-. 

 limited by sex, and is placed in Chapter XII. T\\o lectures in ivis -uppljed the 

 materials for Chapter XVI and for a fragment of < Ihapter XI. The third nmnu- 

 scnpt dates from about 1904, and was slightly revised Inter. It i., the i; 

 and comprehensive treatment of the series and is here mad. .s an ii. 



ductory chapter. Some tabulations or lists which accompanied this paper }, 

 however, been separated from it and expanded to include studies made after I' 

 These expansions treat partly of some crosses made earlier than 1 '.(){ but 

 adequately summarized at that time, and partly of crosses made later- 

 author and summarized wholly by the editor. These completed Minimal : 

 appear as Chapter II. The fourth manuscript, "On the I )ivi>il.ilit < 

 ters," was written in 1906 and is the basis of Chapter XVII. The liftli, dated I'.idT 

 and entitled "Heredity," touches the broader aspects of development and i 

 the first section of the concluding statement of Chapter XIV. To rhi 

 ment have been added three or four pages on " Mendelian Heredity" from a Ice- 

 in 1908 and some other materials from the papers next to be mentioned, which 

 have also found their natural place in the same chapter. 



A seventh and very incomplete manuscript (R Hi. \\ \\ l ,. coii<i-tintc largely 

 of short summaries and conclusions drawn chiefly from later studies. \\a- wri 

 in 1909 and 1910. The conclusions found here, though disconnectedly set down in 

 about 30 small pages, represent Professor Whitman's most mature and final judg- 

 ment in regard to his work with the dominance of sex and color, with its control, 

 and with the dependence of this result upon relative "fertility" and "strength" 

 of the germ-cells. 



The major task of the editor has been the summarising of the data on which 

 these conclusions from the work of the author's later years were ba-ed and their 

 tabulation and presentation. In most cases this has meant the tabulation of d 

 concerning breeding, quotation from the specific record where po-sible. and from 

 the notes of the seventh manuscript till this was fully pre.-eiited: and. finally, 

 undertaking such analysis and discussion as seems absolutely neceary to render it 

 available to students. But such analysis and discussion by the editor have perl. 

 not been unduly pressed; indeed, the editor believes that, although lie has worked 

 much, the reader has yet something to do to avail himself of all that lies in 

 volume. The results of this effort to present fully these materials may be found 

 chiefly in Chapters II to XIV inclusive. The elaborateness of the detailed tabular 

 in those chapters unusual as this method of presentation is will be found quite 

 necessary because of the nature of the problems treated. For this reason, too. it 

 was deemed advantageous greatly to amplify from the numerous later records the 

 relatively few summaries made by the author and to add many unsummari 

 earlier records as well. 



