F. M. Durham 177 



Sable X heterozygous agouti gave 



29 sable, 26 yellow, 15 agouti, 23 black, 4 chocolate. 

 Fi sables from sable x agouti gave 



17 sable, 8 yellow, 5 agouti, 4 black, 2 chocolate. 

 Yellow carrying sable x yellow carrying agouti 

 6 sable, 14 yellow, 7 agouti. 



Agouti Mice. 



I have made some further matings between agoutis on account of 

 the suggestion made by Cuenot(2) that a chocolate mouse was to be 

 regarded as the dilute form of black. He made this suggestion in order 

 to account for the results of breeding agouti by chocolate. 

 I therefore mated agouti with blue (dilute black). 

 F^ was all agouti. 

 F„ gave 30 ag., 13 dil. ag., 10 black, 4 blue, 



32 10-7 10-7 36 calculated. 



These dilute agoutis are well known to the Fancy as Silver Brown, 

 though a better name would be silver agouti. According to Cuenot 

 the cinnamon agouti would be the dilute form, and not the silver 

 browns. 



If cinnamon agouti is mated with silver fawn (dilute chocolate) the 

 Fi is cinnamon agouti. 



F.2 39 c. ag., 10 dil. c. ag., 9 choco., 4 silver fawn, 

 34-8, 11-6, 11-6, 3-9 calculated, 



so that in both cases of golden agouti and cinnamon agouti it is possible 

 to produce a diluted form. 



Other matings are : agouti x silver brown gives agouti F-^: 



Agouti Silver brown 



F2 45 16 observed 



45-75 15-25 calculated 



Silver cinnamon x silver fawn gives silver cinnamon : 



Silver cinnamon agouti Silver fawn 

 Fi 25 10 observed 



26-25 8-75 calculated 



Agouti X cinnamon agouti gives agouti F^ : 



Agouti Cinnamon agouti 



^2 9 4 observed 



9-75 3-25 calculated 



