DAPPLED AND STRIPED HORSES 71 



In another place I have endeavoured to account for this 

 coincidence. 



In Fig. 40 (No. i) I have given a diagram of what might be a 

 portion of the flank veins of a Horse ; and in No. 2 I have shown 

 the same pigmentary reticulations broadened by invasion of the 

 dark pigment, or, what comes to the same thing, by contraction of 

 the white patches. The broad reticulations still correspond with 

 the venous network, shown by dotted lines, which lies in the 



No. i. No. 2. 



^ 



FIG. 40. Diagrams of reticulations of flanks of Horses. 



No. i. (a) white patches ; (b) dark reticulations, coinciding with veins. 

 No. 2. (a] contracted white patches ; (b} superficial veins. 



middle of the channels between the dapples, and therefore are not 

 so conspicuously coincident with the network. When, however, the 

 pigmentary network is fine, it lies over and perfectly coincides 

 with the venous network on the Horse's flank. 



If you observe a dark-grey Horse and a white-grey Horse, you 

 will see that in the former the white spots are disappearing, and 

 mingling more and more with the dark-grey of the ground-colour, 

 to form a uniform grizzly-grey colour, as in the upper Horse of 

 Fig. 38 ; while in the latter the dark reticulations are lessening 

 more and more, and restricted to mere vestiges, mainly on the 



