1G2 Bulletin No. 155.— 1913. 



In other words the cf cf wouUl be barred (heterozygous) while the 

 99 would be black. 



The reciprocal cross would be represented 



& Bf' BfX 

 9 bF 'hS — 



d" cf Bhff, Barred 



9 9 BhFf, Barred 



l)()th cf d^and 99 being heterozygous for barring. In other words, 



all ])rogeny are barred when the cf parent is homozygous for this 



character. 



That Spillman's hypothesis could be verified in experimental results 

 was first shown by Goodale (1000) in a brief pajxT reporting the 

 results of matings between BufT Rocks and Barred Plymouth Rocks. 

 Ill a subsequent note, Goodale (1010) states that in crosses between 

 White Leghorn (9) and Wtiite Plymouth Rock (cf), <>nly white 

 l)irds appeared in Fi; in a f(^w of the.se faint bars developed. In 

 F2» however, there were white, black, gray and barred chicks, the 

 latter resembling exactly the Barred Plymouth Rocks. 



In addition to the instances of barring mentioned above, Pearl 

 (1012) has reported, upon the authority of an English fancier*, the 

 liistor}' of the "Cuckoo Pekins." This bantam breed, according to 

 the authority cited, was produced from a mating of Black Pekin (cf) 

 with White Booted (9). One of the 9 progeny showed "stone- 

 colored bars on a milk-white ground." This bird was mated back to 

 its sire, tne Black Pekin. The cuckoo pullets from this mating were 

 mated with a cuckoo cockerel derived from imported Chinese Cuckoo 

 stock. Inbreeding was practical until a pennanent cuckoo variety 

 was established. Regarding the origin of this barred pattern, Pearl 

 assumes that it did not arise de novo, but that the barred factor was 

 ]iresent in the White Booted parent. However this may be, one 

 further point is of interest, namely, the question of the alleged trans- 

 mission of barring from the White Boot<jd 9 to her daughter. As 



♦Ntr. William F. Kntwisle, who has published the account in his book. "Bantams," Wake6eld« 

 England, 1894 (?). p. 1-116. 



