LAWS OF EXTENSION OF RANGE. 



113 



natural impulse causes the males to go in search of the hens, 

 and it is probably while so doing that they are said to "for- 

 flyga sig" or " fly they know not whither," in Sweden. Witness 

 the occurrences of a male bird at Auchengray, in Lanarkshire, 

 and (whether prior to extinction or not) of the male birds 

 shot at Fort William in 1807, and at Bo'ness in 1811. The 

 following table shows some of the above facts. The statistics 

 are selected from a very large number in my possession, all 

 going more or less to prove what I have above stated. 



TABLE SHOWING OKDER OF ARRIVAL AND ESTABLISHMENT 

 OF THE SPECIES. 



1 The remains of a male were also found in 1856 at Lanrick, or Gartencaber 

 (adjoining). Its death, from unknown causes, very possibly delayed the 

 establishment a year or two. Otherwise, judging from analogous cases, the 

 establishment would probably have taken place in 1857. A separate inform- 

 ant gives 1853 as the date of their first appearance at Lanrick ; but judging 

 from parallel records at contiguous localities, I think this may be too early 

 stated, though, of course, quite within the bounds of possibility. 



2 This male, killed in 1868 at Auchengray, was doubtless a bird wandering 

 in search of a mate from some one of the localities south of the Clyde, where 

 several futile attempts at separate introductions were made. 



3 A very sufficient reason here for the non-appearance of males is the insuf- 

 ficiency of cover. Although the females twice attempted to extend the range 

 of the species in this direction, they were not followed up by males ; or it 

 may possibly have been because the hens were in both instances shot soon 

 after their arrival. 



