238 
Manipulations of the Dipping Compass. 
At the first square northeast of the Washington Monument, called How- 
ard’s Woods. 6h. 37m. to Th. 47m. A. M. 
Sdn 
mggn 
Necdle No. 1. A’ North. 
& 
44h 
[ 8572 39.5 
Mean=71 34.94 
______ Needle No No. 2.. A North. 
oe Sage gprs We < er fe 
Ww Ww. 71 16 
w. E. 71 30.5 
E Ww. 71 08 
B North. 
E E. V1 6d 
Ww Ww. 74, 39 
w gE 1. 52 
E Ww. 71°34.5 
8)572 29.5 
~ Mean=71 33.7 
Mean of No. l=7t 34.94 
2/143 0864 
Mean total=71 34.32 
At the Botanical Garden of St. Mary? FS — Baltimore, April 28, 
. MM. 
Peg 
Maas 
12h. 50m. to 1h. 1 
‘eedle No. }. A North. Newala No.2. A North. | 
E. 70°35/.5 E E. 71°53/.5 
w. 73 00 w Ww. 71 44.5 
E. 70. 35.5 w E. 71 48.5 
| w. 73 07 E w. 71 45.5 
B North. B North. 
E. 72 46 E E. Zi. 37 
Ww. 70 20 Wi. a We 71 32.5 
E. 72 38.5 w E. “1 32.0 
w. 70 14 E w. 71 16.5 
| S)a73 16.5 8)573 10.5 
| Mean=71 39.56 Mean=71 38.81 
Mean of No. 1=71 39.56 _ 
2)1 143 18.37'_ 
Mean toal=71 39.18 
At both iidalities Mr. Nicollet made observations on the same 
day and nearly at the same hours with a similar apparatus, ma- 
nipulating at my request in the same manner as I have just de- 
scribed. The results were remarkably coincident, as have been 
others at the same localities. 
oward’s Woods. 
Prof. "Bechis Aug. 
By 
By Prof. Locke. 
Apa 23, Tost 34. 
By Mr. Nicollet, April 28, Ted, 71 34. 
By Maj. 10, 1841, 71 31 
Graham, June 
oR 
71 
71 
St. Mary’s College, 
034) Prof. Rocks did not coee at this locality. 
Locke, April 23, 1941, of 2 
33.8 
'9| By Moj. Graham, June 11, 1841, 71 
