220 BULLETIN OF WISCONSIN NATURAL HISTORY SOCIETY. VOL. 2. NO. 4 
]\Iadisox, Wis., Apr. i8, 1900. 
^Ieteorological Data. 
Wind — Northwest to southeast, velocity 4. 
Temperature — 46. 8°. 
Atmosphere — Cloudy to clear. 
Total number of birds observed from 11:15 P.M. to 1:15 A. 
M. — 121. 
11:15 to 11:30 — in 3.9 — out 8.1. 
in 4-5— o^^t 7.7. 
in 4.0 — out 8.3. 
in 4.0 — out 8.2 — Size 2. 
in 3.6 — out 8.7 — Curved up. 
in 3.8 — out 8.4 — Curved up. 
in 3.9 — out 1.3. 
in 3.5 — out 8.6. 
in 3.1 — out 8.8 
in 3.7 — out 8.9 — All the above birds are about 
the size of a robin, 
in 4.7 — out 8.6 — Swift, 
in 4.2 — out 8.1 — Curved down, 
in 4.3 — out 7.8. 
in 3.1 — out 2.3. 
in 0.0 — out 0.0 — About one minute with no 
birds. 
in 3.4 — out i.T. 
in 4.9 — out 6.9 — Out of focus. 
in 3.1 — out 8.9. 
in 0.0 — out 0.0 — Direction missed. 
in 2.5 — out 1.8. 
in 4.3 — out 8.3 — Size i. 
in 3.4 — out 1.2 — Very slow. 
in 3.6 — out 8.2. 
in 3.7 — out 7.9 — Followed preceding very 
closely. 
in 3.Q — out 7.9. 
in 3.2 — out 8.9. 
in 3.2 — out 1.3 — Curved up. 
in 3.8— out 8.2— Swift— Size 3— Fast flyer and 
of large size. 
in 3.8 — out 1.7. 
in 3,8 — out 8.9 — Slow. 
in 3.6 — out 8.5. 
