EXTENDED SERIES. 



55 



Cross 19. Black agouti heterozygous in color factor, black, and agouti crossed with brown 

 heterozygous in the color factor. YBr^EDxPiA xYBriD-iPn. Expectation, ZBAg, 

 3 , 3 BrAg, 3 Br, 4 W. 



Black agouti x dilute brown. 



Cross 20. Black agouti heterozygous in color factor, black, and density crossed.with dilute 

 brown heterozygous in color factor. YBriBDdPiAt x YBridiPi. Expectation, 3 BAg, 

 3 dBAg, 3 BrAg, 3 dBrAg, 4 W. 



Cross 20a. Homozj^gous black agouti x homozygous dilute brown. 



YiBr2B2D2P2A2 xY^Br^diPi. Expectation, all BAg. 



Cross 20b. Black agouti heterozygous in black and density crossed with homozygous dilute 

 brown. YiBrSDdPiAi x YiBr^diPt. Expectation, 1 5^^, 1 dBAg, 1 BrAg,^\ dBrAg. 



Cross 20c. Black agouti heterozygous in black, density, and agouti crossed with homozy- 

 gous dilute brown. Y2Br2BDdPiA x Y2Br2d2P2. Expectation, 1 BAg, 1 BrAg, 1 dBAg, 

 1 B, 1 dBrAg, 1 Br, 1 dB, 1 dBr. 



