486 
Dr. A. L. Thomson : Results of a Study of [Ibis, 
The percentage o£ marked Lapwings recovered is thus 
approximately 2’0, if calculated 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*8 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 1 . 
Case No. 
Date of 
.Reappearance. 
Locality of Reappearance. 
Marked as 
chicks in the North of Scotland. 
1912. 
410 
20. 8.14 
Place of marking-. 
1913...| 
403 
ca. 22.11.13 
Co. West Meath, Ireland. 
899 
early 1.14 
nr. Oporto, Portugal. 
