380 OBSERVATIONS ON THE MAGNETIC DIP. 
Nore.-—The point of observation is one hundred and thirty feet north-west from the iron monument on Hall’s 
Stream, which marks the eastern extremity of the line of Valentine and Collins, running thence along the northern 
limit of the states of Vermont and New York, (under the provisions of the treaty of Washington, of 1842,) to the 
river St. Lawrence, at St. Regis. 
December 19, 1845. 
{ | Polarity of | Dip observed ee Total 
| Meantime of |Temperature| marked end| with poles direct No. of | Dip vo. of 
observation. (Fah.) of needle. and reversed. readings. | by each needle. | readings. | 
| 
| Nerepis No.1. 
1h. 31m., p.m.) 42° N 76° 24.31 | 24 ie al 
i2 03 P.M. 39° S 76° 21'.6 24, 16 22 95 48 
Nerepwe No.2. 
2h. 30m.,P.m.| 38° N 76° 25'.12 | 24 iii 
3 00 p.m) 37° s 76° 22/91 vt: sistas ceo Fen 
Dip, by a mean of ninety-six observations on the two needles, . . . . . 76° 23/48 
The weather was cloudy, with an occasional slight fall of snow and a very gentle wind 
from the south-west during the observations. The snow two fect deep upon the ground. 
The observations were made under a tent free from iron fixtures. 
These are the last observations made in the field during this season 
ERRATA IN THE PRECEDING PAPER. 
Page 333, transpose the date, February 12th, to head the observations with marked end of needle A, north pole 
«334, and following pages, italicise the words, “ First,” “ Second,”’ &c. 
«339, in tables two and three insert the initials J. J. G. in the last column, as observer. 
“341, sixth line from top, for “The calculations were therefore received,’ read The calculations were 
therefore reviewed. 
345, omit the words “AnD DEcLINaTion,”’ in the running head, from this page to the end of the paper. 
the needle, in a column on the right side of the table, opposite to the repetition of needle No. 1 with 
marked end north. 
“ 354, last line, for “71° 55/.85,” read 71° 50.7. 
“ 363, first line, for «late the Widow Michean’s,”’ read, late the Widow Micheaw’s. 
“371, thirteenth line from top, for “'77°51’.07,”’ read, '76°51’.07. 
“ 375, table A, fifth line from top, for “ 4h. 58m. 25s.,”’ read, 4h. 53mm. 27s. 
“ 378, third line from top, longitude of the astronomical station at Lake Memphremagog, for 4h. 48m. 50s., W. 
read, 4). 48m. 52s., W. 
“ 378, table B, end of first part of the table, for “Dip observed on,” read, Dip observed in. 
gc7?lt must be remarked that the repetition of the name of the same station, which so often occurs, was 
intended to have been a running heading, at the top of the pages. See pages 333 and 346, 
351, place the remarks commencing, “ Having applied the magnets,” in relation to reversing the poles of 
