R Staples-Browne 133 



2. Matings of Silver Owl and Black Fantail pigeons. 



3. Matings of Blue Dragoon and Dun Carrier pigeons. 



In the case of the Rock Dove crosses the sex-limited inheritance 

 of silver was not discovered, as in all cases the matings made were 

 those of silver $ x blue (/. In this case the oflFspring were all blue 

 according to expectation. The reciprocal mating of blue ? x silver ^ 

 is being tried this year. 



To test fully this question the following matings are necessary : 



1. dun $ X black <^. 



2. black ? X dun «/•. 



3. silver ? x blue ^. * 



4. blue $ x silver </•. 



5. silver ? x black ^f . * 



6. black $ X silver (/*. * 



7. dun $ X blue (^. * 



8. blue $ X dun j/*. 



Of the above, Nos. 3, 5, 6 and 7, marked with an asterisk, have been 

 made ; the remainder are being tried this year, as is also the relation 

 of Silver to Dun. 



The results obtained so far from these crosses are as follows : 



3. silver $ x blue ^^ gave all offspring blue. 



5. silver $ x black f^ gave all offspring black. 



6. black $ X silver (/* gave black ^ and dun % . 



7. dun $ X blue f^ gave all offspring black. 



Supplementing the evidence of sex-limited inheritance in silver the 

 following matings may be given, but it must be understood that the 

 shade and patterns of the offspring are for the present purpose neglected : 



Silver $ x Red (containing yellow) ^ gave 3 red and 2 yellow. 



Red % X Silver (/* gave 5 red ^s and 3 dun ?s. 



The inheritance of red and yellow will not be alluded to again in 

 this paper. The question is complicated, and no statement can be made 

 until much more work has been done. The experiments with the red 

 birds derived from the Barb-Fantail crosses were continued, but the 

 birds were ultimately lost by disease. A new series has been started, 

 the reds used being Dragoons. 



