J. S. W. NUTTALL 121 



Observed appearance of 71 birds produced in this group : 

 (71) 50 Red cheq. : 11 Blue cheq. : 8 Mealy : 2 Blue. 



Group 2. Red Chequer x Blue Chequer. 



Composition of parents — five red chequers as in group 1, two blue 

 chequers rOrC and rCrc. 



Types of mating possible, 10. 



Number of offspring, 160. 



Calculated appearance : 



(160) 100 Red cheq. : 44 Blue cheq. : 8 Mealy : 8 Blue. 

 (94-8) 59-3 : 261 : 4-7 : 47. 



Observed appearance of 95 birds produced in this group : 

 (95) 41 Red cheq. : 50 Blue cheq. : 2 Mealy : 2 Blue. 



Group 3. Red Chequer x Mealy. 



Composition of parents, red chequers as in group 1, mealies RcRc 

 and Rci'c. 



Types of mating possible, 10. 



Number of offspring, 160. 



Calculated appearance : 



(160) 104 Red cheq. : 46 Mealy : 8 Blue cheq. : 2 Blue. 

 (44-9) 29-2 : 129 : 2'2 : 06. 



Observed appearance of 45 birds produced in this group : 

 (45) 28 Red cheq. : 11 Mealy : 4 Blue cheq. : 2 Blue. 

 Group 4. Red Chequer x Blue. 



Composition of parents, five types of red chequers as in group 1, 

 a single type of blue, rcrc. 



Types of mating possible, 5. *" 



Number of offspring, 80. 

 Calculated appearance : 



(80) 40 Red cheq. : 16 Mealy : 16 Blue cheq. : 8 Blue. 

 (40) 20 : 8 : 8 : 4. 



Observed appearance of 40 birds produced in this group : 



(40) 17 Red cheq. : 7 Mealy : 11 Blue cheq. : 5 Blue. 

 Group 5. Mealy x Mealy. 

 Composition of parents, RcRc and Rcrc. 

 Types of mating possible, 3. 

 Number of offspring, 48. 



9—2 



