618 THE AMERICAN NATURALIST. [VoL. XXXIV. 
The stream bottom was mainly gravelly, but in many places 
sandy. The average width of stream B was ten feet, and of 
stream A three and one-half feet. Both had a moderately 
swift current. 
Our observations were rather brief, covering only a portion 
of five days, from April 15 to April 20. Previous to April 15 
there had been a succession of several warm days. On the 
15th there was a decided fall of temperature. On the 17th 
another warm spell set in. On the 20th the temperature of 
the water at 4 P.M. was 63? F. 
Gage is of the opinion that the males precede the females at 
spawning time and commence nest building before the arrival 
of the latter. This opinion is supported by the results ob- 
tained from a weir in the inlet of Cayuga Lake, N.Y., in the 
spring of 1898, which are recorded by Surface, and also by our 
own observations. Following is a record of the number and 
sex of the fish taken by us during the period of observation. 
APRIL. TiME OF OBSERVATION. AY 9 Q SPAWNED. 
15 3-5 P.M. I — 
17 3-5 P.M. 8 or 10? iie x 
18 4-6.30 P.M. 44 ti? e 
19 5.30 A.M. to 6.30 P.M. 98 18 9 
20 3-4.30 P.M. 2 14 4 
The activity of the lampreys and their manner of nest build- 
ing are shown by the following results, which are the average 
of sixteen nests observed. 
No. or Stones MovED. 
‘TIME OF OBSERVATION. : 
sh. 
Up Stream. | Down Stream. Lateral. No. of Fi 
41 minutes 4 | 2 I 2-3 
LESBIAN prrsgncemd 
! Surface, H. A., M.S. The Lampreys of Central New York, Bulletin for 
National Fishery Congress, United States Fish Commission (1897); PP- 145-37!- 
? Stream A only. 8 Probably all nem 
