60 



Editorial. 



EiaEata: Page 1, line 5, from top, a''ter ■ ub-: pedes, delete 



and. 

 „ 27, line 8 from top, for ' Fazy.--liill Gull," reai 

 11, line 5 from l^ottom, for "specimens" read 



iiuIUiduah. 



Razor -bill (Alca tordi). 

 28, line 3 from tottom, for '(/'. schiiticops)" 



read (F. schisticeps) . 

 28, line 11 from bottom, for "major" reail 



Major. 



Correspondence. 



BUDGERIGARS AND MENDELISM. 



Sir,— 1 am much interested ia tiie Meiideliaii Tlico.y of Here^ 

 dity, and am anxious to ijrove wlietJier it will turn out to be 

 ti-uo in the case of the B'udgerigar and its yellow variety. I pro- 

 pose, therefore, du:ing the coming season, to put up a few pairs in 

 separate breeding vlaces (this is very important), ajid record the 

 reiults. If the yellow variety (desigaaled Y in the appended table) 

 is dominanl over the type (designated G), the results in the first 

 geneiation should be. 



t (1) Cf tr + 9 Y=all G of both sexes, the. e leiag called hete - 

 ozygotes. 



* (2) o' ^' + 9 G=all cf ^ (heterozygotes) and all 9 V. 



Lf these results come out true, it wi 1 be possible to ulilise 

 ihe hetei ozygotes (H.) in order to prove further that: 



(3) o' H + 9 H=all cf Gt, but 9 half G and half Y. 



(4) cf H + 9 Y=^half G and ha'f Y, of both sexes. 



(5) o' V + 9 H=all cf t> and all 9 Y. 



It will be noticed that the results of tlie two pairings {_2) 

 and (5) are identical. 



'I'lie sixth possible combination cf Y -|- 9 ^ should produce 

 all V, and as from my rather limited experience 1 dnd this to be 

 the case, 1 am quite hopeful that the results of tJie otli.or five pair'- 

 /.igs will corroborate the Mendelian Theory. 



Jf airy of my fellow -members feel inclined to carry out col- 

 lateral experiments, and publish the results, they would be conferiing 

 a favoui- en Mendelians, who are a rapidly increasing sect of scientists. 

 It is, of course, of primary importance to start the experiments, 

 T cf=male; 9- female. 



* Eoughly speaking, a lieteiozygote is 



yellowness concealed in it. 



g-i'een Budgerigar with 



