DAIRY FAKMIXU DAIRYING AGROTI'^CHNY'. 1073 



"The yellow e;in:ir.v is derivod from the original 'green' canary by the loss 

 of black. It carries a mottling factor. Consequently when the yellow canary 

 is crossed with a pigmented canary or with a finch the hybrids are mottled. 



"The mottling is not a fixed pattern. The spots vary in position and relative 

 size — they may cover nearly the whole body or they may form a mere ' ticking.' 

 The degree of mottling is inheritable. Ticking behaves as a unit-character. 



"Mottling is a heterozygous character and throws mottled, clear yellow, and 

 self -greens. 



"The principle of localization of the units of a complex jdumage must be 

 recognized. The cap of the Lizard canary, the red face of the goldfinch, the 

 shoulder striping of the green canary are not only unit-characters but they 

 occur only at their proper localities and in their proper forms in the body 

 plumage. In mottled canaries the presence of black on the shoulder means 

 striping, on the wing it means dead black, white-laced remiges, on the mid- 

 breast it means a uniform olive color. The plumage of a yellow canary may be 

 compared with a letter that has been written with invisible ink. Wherever 

 the developer acts (i. e., the black pigment of the green canary is added) that 

 which is written appears with all of its idiosyncrasies." 



The influence of the testes upon the secondary sexual characters of fowls, 

 C. E. Walker (I'roc. Roy. ISov. Med. [London], 1 {1908), A'o. 6, pp. 153-156, 

 fign. 5; abs. in Arch. Itaancn u. GcscU. Biol., 5 (lOOS), No. .J, pp. 565, 566). — 

 The macerated testes of a cock were strained, mixed with normal salt solu- 

 tion, and subcutaneous injections of i cc. made daily on 2 adult laying hens 

 from February 1 to August 30, 1907. From that time until October 4, when 

 the injections were discontinued, the amount of extract was reduced one-half. 



A few days after beginning the injections the combs and wattles became 

 brighter in color and grew considerably until the end of June. By October 4 

 they became bluish, wrinkled, and flabby. There was no noticeable change in 

 the spurs. From the middle of March the hens ceased laying until January, 

 I'JOS. Though peaceable at the beginning of the experiment they began to 

 attack the cocks a few weeks later. Evidently the testes possess some func- 

 tion which inlluences or controls the appearance of the secondary sexual 

 characters. The potentiality of dift'erentiatiou necessary to the production of 

 some at any rate of these characters is itreseut iu the cells of the female. 



DAIRY FARMING— DAIRYITfG—AGROTECHNY. 



The farm dairy, II. P.. (Jlki.ku (Cliicago, 111., 1008, pp. 16',, phs. J8, fifj.s. J).— 

 This popular work, which treats of the dairy herd, cow stables, rations for 

 dairy cows, silos, handling of milk, butter making, and other dairy matters, is 

 of a practical nature. The author dedicates it "to the boys, hoping that it will 

 help them to see the opportunities in the field of agriculture and esi)ecially in 

 dairying, the most profitable branch of agriculture when its p()ssil)ilities are 

 (Icvclopcd." 



The care of milk on the farm, I. 1*. Whitney {W<if<liin(/ton Sfa. I'oiniltir 

 Hid. U, pp. .'/). — This bulletin contains brief notes on the proper care, handling, 

 and cooling of milk on the farm to avoid premature souring or contaniination 

 from dirt and bacteria. 



The score-card system of dairy inspection, C. B. Lane and (I. M. Wiin- 

 aki;r iV. S. Dipt. .\<ir., liitr. Aniin. Indus, ('in: l,VJ, pp. 32. dfimx. 2, map 1). — 

 The .scor(vcard system of insjiecting the milk supjtly is »'X[ilain(Hl, and its advan- 



