48G 



Dr. A. L. Thomson : Results of a Study of [Ibis, 



The percentage of marked Lapwings recovered is thus 

 approximately 2'0, if calcidated on the total. But when 

 calculated for separate years the figures vary from 0*4 to 

 3*3 per cent, if all years in which over 200 were marked be 

 taken, and from 1"3 to 3*0 per cent, if limited to those 

 years in which over 400 were marked. Similarly, the 

 percentage varies from 1*0 to 2'^ when calculated separately 

 for the regions in which over 200 were marked, and is 1"9 

 in the case of the single region in which the number was 

 much larger. In making comparisons between the numbers 

 of records falling under particular headings, therefore, it 

 would be unsafe to attach significance to any figure which 

 could not be assumed to represent a total of several 

 hundred marked birds. Numerical contrasts are accord- 

 ingly permissible only between the widest categories, and 

 analysis must be for the most part qualitative rather than 

 quantitative. 



As this species is of especial interest, and as it is the first 

 to be discussed here, the records and the various forms of 

 analysis are given in full. Table III. is a complete list of 

 all the reappearances, grouped in the manner already 

 explained. 



TABLE III. 

 List of Reappearances of Marked Lapwings. 



Season of 

 marking. 



Case No. 



Date of 

 Reappearance. 



Locality of Reappearance. 



Marked as chicks in the North of Scotland. 



1912. 

 1913. 



■{ 



410 



403 

 899 



20. 8.14 



ca. 22.11.13 

 early 1.14 



Place of marking. 



Co. West Meath, Ireland, 

 nr. Oporto, Portugal. 



