417 
per cent. of the whole number identified. The English sparrows were 
much the most abundant, their number amounting to nearly 43 per cent. 
of all the birds seen on the trip across the northern end of the state. The 
prairie hen was represented by 42 birds, equal to 3.6 per cent. of the 
whole number listed. 
RESMENCE CLASSIFICATION, WAUKEGAN TO SCALES Mounp, 
Marcu 2-15, i907 
NUMBER AND PPR CENT OF SPECIES 
Permanent Winter Summer Migrant’ All 
Number fal 4 8 1 24 
Per cent. 45.8 16.7 Bees 4.2 100 
NUMBER AND PER CENT OF ALL BIRDS 
Permanent Winter Summer Migrant All 
Number 846 = PASS 38. 5 1107 
Per cent. 76.4 19.7 ono 0.6 100 
NUMBER AND PER CENT OF NATIVES 
Permanent Winter Summer Migrant All 
Number Die Ss 218 38 5 632 
Per cent. 58.7 34.5 6.0 0.8 100 
That the spring migration movement was in progress in extreme 
northern Illinois during this first half of March, 1907, may be seen by 
comparison of the species ratios of the residence classes of March 2-15 
with those of January 2-16 as follows: 
RATIOS oF Specias, NORTHERN ILLINOIS, WINTER AND SPRING 
Permanent Winter Summer Migrant 
January 2-16 Bihie 19.0 19.0 4.8 
March 2-15 45.8 16.7 BoD 4.2 
The sum of the ratios of permanent and winter resident specie 
for the spring period is less by 14 than that for the winter period, and 
the summer resident species ratio is greater by the same amount. A 
comparison of the numbers of native birds in the several classes, gives 
much the same result, although the differences are less conspicuous. 
The permanent and winter total for January exceeds that for March 
by 5.2, and the summer and migrant total falls short the same number. 
Ratios or Native Biros, NorruHern ILLiInois, WINTER AND 
Sprine, 1907 
Permanent Winter Summer Migrant 
January 2-16 61.4 37.0 1.3 0.3 
March 2-15 58.7 34.5 6.0 0:8 
From the foregoing statements, we may infer that certain species 
of permanent and winter residence had lost in the early spring so many 
of their numbers to the north that representatives of them were not 
found on the March trip across the northern end of the state, but that 
