306 C. Whittlesey on the Water Level at Green Bay. 
In the month of August, 1858, at my request, D, UNDERY 
Esq., cheerfully consented to make hourly observations s 
as it could be done consistently with his occupations. — 
derwood is the observer at Green Bay for the Smithsonian 
tution at Washington: a capable and faithful person, havinga — 
strong inclination for all subjects connected with natural science, 
which has given its name to the town, is on an arm 
of Lake Michigan, about 120 miles in- length, and its greatest — 
width about 20 miles. It opens into the lake not so much by — 
direct channels as by side ones among islands that lie across the 
mouth, which is about 25 miles in width. In general formit 
resembles the half-fledged wing of a bird attached to its body 
by its side and at the largest end. The general direction of its 
axis or middle line is northeast by north, making an acute a 
with the coast line of Lake Michigan. A narrow peninsula 
coming to a point at the “ Port-des-Morts,” lies between __ 
and the lake, rising from 100 to 200 feet above the water leve. — 
The western shore of the bay is low and swampy; winds that 
blow across the bay from the northwest, therefore, act more 
powerfully on its waters, locally considered, than those from the 
opposite quarter over the bluffs of the eastern shore. At Gre 
Bay and Fort Howard the shore lines approach to a pot 
rom Mr. Underwood’s register I have toa considerable extent 
condensed the readings so as to express them in substanc i 
the form of curves, At the broken or dotted portions the 
servations are wanting. , We assumed an arbitrary line of plane 
of reference intended to be above the floods of the year 1808, 
and called this zero. : 
By means of the tables and of the diagram [see Plate) the 
written portion of this article is very much abridged. 4 o 
‘ But for E 
rvations. ce he 
ed ase a tide arising é 
from that cause would therefore occur with regal ion 
aR occupied by the corresponding strength and prevailing 
the winds, as observed locally, exhibits only their 
general condition. 
On the 22d of September only four hours passed d 
— but most of the days began at 5 A. M an 
Pp, M, : e 
a 
Fd 
at 
