1880.] 
81 
[Nichols. 
the surface (16°. 90), to a depth of 300 feet; from 300 to 540 feet the temperature was 
4°. 35. On April 11, 1875, the temperatures were, at surface, 8°. 60; from 10 to 125 
feet, 3o.50-3o.55; from 150 to 300 feet, 3°. 60-3°. 65; from 400 to 540 feet, 3°.70. The 
author employed a Casella deep-sea thermometer, and also another thermometer ot 
peculiar construction.] 
Struve, H. — Kurzer Bericht liber eine Reise auf dem Ladogasee 
Bull. St. Petersb. vn (1864), pp. 510-515. 
[Observations on Lake Ladoga made in June, 1864, showed on two different 
days the following temperatures, the air temperature being in the second instance 
8°.5 C., in the first instance not given. 
Surface 4°.0 C. Surface 3°. 2 
Bottom, 474 ft. 3°.8 Bottom, 672 ft. 3°.8 
Thompson, Z. — Sudden disappearance of ice on Lake Champlain. 
Amer. Journ. Sci. (2) xii (1851), p. 22. 
[Observations of temperature made through the ice, quoted above.] 
United States Fish Commission. — Observations made by J. W 
Milner on Lake Michigan are alluded to in the Report for 18 7 2-73, p. xv. 
United States Lake Survey. — Observations were made in 1871 
on Lake Superior. The results are briefly alluded to in the Report of 
the Chief of Engineers, 1871, p. 1021, and have been quoted above. 
Allusions are made to earlier observations in the Report of Superinten- 
dent of Lake Survey, 1860. 
United States Signal Service. — Daily observations on temp- 
erature are made at the following lake stations: Alpena, Buffalo, 
Burlington, Chicago, Detroit, Duluth, Escanaba, Grand Haven, Mar- 
quette, Milwaukee, Toledo. The observations are made at top and 
bottom, but in shallow water. The observations are not published in 
detail, but monthly maxima and minima are given on the monthly 
weather map, No. n, and, in the Report of the U. S. Fish Commis- 
sioner for 1875-76, pp. 851-861, there are tables of observations from 
March, 1874, to February, 1875, and from March, 1876, to February, 
1877, inclusive. 
Zerrenner, C. — Beobachtungen fiber Gewasser-Temperaturen. J ahrb. 
d. geol. Reichsanst., iv (1853), pp. 492-493. 
[Observations of surface temperature on several lakes of Southern Bavaria, the 
Tyrol and Northern Italy.] 
Mr. S. H. Scudder read a paper on the character of the tertiary 
insect fauna in the Florissant beds, comparing it with that of 
Oeningen and Radoboj. The nature of the rest of the fauna 
was also noticed, especially the nearly complete absence u of mol- 
luscs. 
With regard to the latter point, Prof. E. S. Morse observed 
PROCEEDINGS B. S. N. H. VOL. XXI. 6 SEPTEMBER, 1881. 
