E'o. 640] SHORTER ARTICLES AND DISCUSSION 



471 



and guinea pit:'. It appeared that similar changes in the mouse 

 were po.«sil)le and could be found, if persistently sought. With 

 this general thouglit m mind, T attempted by corresponding with 

 fanciers et cetera to locate dilute mutations in mice, thinking 

 that the dark red-eyed yellow mutation (parallel to the type 

 found 111 rats) or the dilute forms allelomorphic to color and 

 albinism (parallel to the guinea-pig and rat series) might be 

 possibilities. My correspondence with fanciers brought no re- 

 sults, but a dilute mutation appeared from a rather unexpected 

 source- On August 31, 1920. Mr. J. E. Knight of Weldon. 

 Illinois, who ext(M'niniates rodents trom corn cribs, poultry houses 

 and the hko. iiiul who lias iiuich opportunity to examine a large 

 numbei ot ilif>r iuiiiiiin;ils. brought to my laboratory a young 

 male mutaiiT iiioii>.' winch he had captured in a corn crib, located 

 on a tmn s, n „ ,„il . tioiii th. luaiest t<.\Mi Thi^mimal on a 

 fu^t 111 1> Ills. i\ \ iiiiiii itinii ui\. til. ipp. iiai.< of being an 



first pelage, but tlu 

 shade —a little liglr 

 sliiiht dnll ^Hkmis 



^ed lat The daik e>es and ^( 

 iiggested that the mutation w. 

 ellow rat. Recent matings ha 



