CONTENTS. 



Pakt I. The Factors Producing Color in Mice. 



Page. 



Formative and distributive color factors 18 



Location of pigment 19 



Formative color factors 19 



1. The general color factor, Y 19 



2. The brown-producing color factor, Br 21 



3. The black-producing color factor, B 21 



Distributive color factors 22 



4. The distributive factor, D 24 



5. The distributive factor, P 27 



6. The distributive factor, A 30 



7. The distributive factor, R 31 



8. Sooty yellows and sables 34 



The inheritance of spotting 38 



Crosses with Japanese waltzing mice 43 



Association of characters 44 



Part II. ExPERiiMENTAL Data. 



Explanation of symbols 47 



Color varieties of mice 49 



Extended Series 50 



I. Black agouti (fig. 1) 50 



Black agouti x black agouti 50 



Black agouti x dilute black agouti 51 



Black agout i x brown agouti 52 



Black agouti x black 53 



Black agouti x brown 54 



Black agouti x dilute brown 55 



Black agouti x pink-eyed brown 56 



Black agouti x pink-eyed dilute brown 56 



II. Dilute black agouti (fig. 2) 56 



Dilute black agouti x dilute black agouti 56 



Dilute black agouti x black 57 



Dilute black agouti x pink-eyed black 57 



Dilute black agouti x pink-eyed dilute black 57 



Dilute black agouti x pink-eyed black agouti 57 



Dilute black agouti x pink-eyed dilute black agouti 57 



Dilute black agouti x brown 58 



Dilute black agouti x pink-eyed dilute brown 58 



III. Pink-eyed black agouti (fig. 3) 59 



Pink-eyed black agouti x pink-eyed black agouti 59 



Pink-eyed black agouti x black 59 



Pink-eyed black agouti x pink-eyed black 60 



Pink-eyed black agouti x dilute black 60 



Pink-eyed black agouti x dilute brown agouti 60 



Pink-eyed black agouti x brown 61 



13 



