236 



Coat-ColoKf in Babbits 



agouti markings are imich more in evidence and are spread more evenly 

 over the whole coat (cf. PI. XII, fig. 1). The various corresponding 

 forms in the black and in the chocolate series may be set out in tabular 

 form as follows : 



Agouti 

 Black 



Yellow 



(PI. Xm, fig. 2) 

 Tortoise 



(PI. XIII, fig. 4) 

 Agouti-black 



(PI. XII, fig. 2) 

 or 



(PI. XII, fig. 1) 



Black Series 



AABBEEdd 



aaBBEEdd 

 / or 



I AABBEEDD 

 ^ or 



[ AABBEeBd 



AABBeedd 



Chocolate Series 



aaBBeedd 



AaBBEEDd 



AaBbEEDd 



Cinnamon 



(PI. XIII, fig. 3) 

 Chocolate ... 



(PI. XII, fig. 4) 



Dilute Cinnamon.. 



Orange 



(PI. XIII, fig. 1) 

 Deep cinnamon . 



(PI. XII, fig. 3) 



AAbbEEdd 



aabbEEdd 



AAbbeedd 



aabbeedd 



AabbEEDd 



The HimaUujan pattern. 



It has already been pointed out that the Himalayan pattern is 

 recessive to self-colour, a fact which had been previously demonstrated 

 both by Hurst (6) and Castle (1). Castle has also shewn that the 

 Himalayan pattern behaves as a dominant to the complete albino. My 

 experiments have enabled me to add a few more points of interest in 

 connection with this peculiar pattern. 



In the first place there is a Himalayan form corresponding to each 

 full-coloured variety, i.e. there are black Himalayans, chocolate Hima- 

 layans, agouti Himalayans, etc., etc. The black Himalayan is indis- 

 tinguishable in appearance from the agouti-black Himalayan because 

 the distinctive hairs of the agouti-black occur only on those parts of 

 the body where the Himalayan is entirely white. The agouti Himalayan 

 is quite distinct from the black Himalayan as may be readily gathered 

 from the figures on Plate XIV'. The Himalayans corresponding to agouti, 

 tortoise, and yellow are not readily distinguished until they are nearly 

 half grown, and even then the distinction is not always very clear. 

 This is largely because the Himalayan shews no yellow. A "Himalayised" 

 agouti for example contains in its points only the melanic pigment of 

 the agouti, those parts of the hair which are yellow in the agouti being 



' Castle's "intermediate" Himalayans were probably of this nature, the albino ? ? used 

 by him being heterozygous for A ((1), p. 70). Indeed in his latest paper (3) he recognises 

 the distinction between the Himalayan bearing A and that without it. 



