202 COLIN CLOUT'S CALENDAR. 



that the Scotch grouse is a truly native breed, slightly 

 altered by the conditions of its insular habitat from a 

 closely allied Continental species, whose representatives 

 elsewhere have now all assumed the guise of Scandi- 

 navian willow-grouse. In other words, the two isolated 

 groups into which the species has split up have altered 

 each in its own way, but the Continental variety has 

 moved faster away from the primitive type than its 

 British congeners. 



