and parts of adjacent States. 373 
The difference between the lines of this and the previous hy- 
pothesis shows the large amount of local irregularity. 
_ The lines of this hypothesis pass through the following posi- 
tions: 
4° Long. 81°-0 Long. 77°°5 Long. 74°-0 
Lat. 39 58’ Lat. 39 47’ Lat. 39 36’ 
40 Long. 81°-0 Long. 77°°5 Long. 74°-0 
Lat. 41 01’ Lat. 40 49’ Lat. 40 39’ 
38 Long. 81°0 Long. 77°°5 Long. 74°-0 
Lat. 42 02’ Lat. 41 51’ Lat. 41 41’ 
36 Long, 81°°0 Long. 77°5 Long. 74°-0 
Lat. 43 04’ Lat. 42 53’ Lat. 42 438’ 
The observed and computed values of X by the previous and 
last hypothesis compare as follows: 
; x Le 
Station. by prev by last 
observed. | jh ase : rgateenta: ~ 
Philadelphia,* 417 19 -0'02 4-14 +0°03 
Doylestown 419 411 +008 4:08 +0'1L 
Easton, 412 4:02 +0°10 4 +0°12 
ing, 4:00 410 -O10 4:08 -0'08 
Frenchtown, 431 4:27 +0°04 4:22 +0: 
Baltimore,* 4:26 4 32 -0:06 4:29 -0° 
ashington, 4:34 4 —0-06 4°37 -0'05 
Harrisburg,* 4:07 4it -0-04 4:10 —0'03 
n’s Island, 3: 4:08 -O-12 407 -o'll 
Near Mercers # 4:18 4:21 -003 420 | ~002 
h, 403 4 06 -0'03 a 08 -—0:05 
Frostburgh, 429 4:20 +0'09 4:24 +005 
Near Brownsville,* 4:20 4:14 +0-06 419 +0°01 
Near Pitts 4:05 4 -o-or 4:09 -0'04 
nomy, 4:00 4°04 -0-'04 4-07 -0'07 
ng, 4:05 Ait -0'06 4:17 -or12 
Steubenville, “94 ‘O7 -o13 me SET, 
98 94 +0'04 3°95 03 
ercer, 4-00 +006 “95 +0°05 
Ashtabula, “84 +0:04 “83 +0-01 
"29 Sr -0'02 fe ig | +002 
62 -0'08 70 -0:08 
Ellicottsville,*. 72 75 -0'03 “7 —O'01 
Berlin’s Tavern, 4-02 “93 +0°09 +0-08 
insville,* “00 “98 +0 02 +O01 
Belvidere ‘67 3-75 0-08 74 -0'07 
h, “68 "70 —0'02 70 -0 02 
2 , 61 te & “O12 “74 -0'13 
Silver Lake,* 48 “96 +0°02 7 +0 
Wi rre, 9 3-93 “03 3'9t +0:05 
Williamsport,* 98 1°36 “92 +0°06 3°92 +0°06 
Bellefonte, 4:07 ‘ 99 +008 : 9 +0:08 
Lewistown, 3-98 40 -0'07 4o -0-07 
Huntingdon,* 410 4-06 +004 407 +0°03 
Niagara Falls,* 57 3-62 -0 05 358 -O 01 
-Toronto,* 54 203 +o°01 3-49 +0°07 
Rochester, 56 3-57 -oor 3-56 0-00 
Geneva,* 64 35 +0-05 3-60 +0°04 
Syracuse,* 56 53 +003 3 000 
Oswego, “47 3-46 +00! 3-49 -0'02 
Ax. Jour. Sct—Srconp Surtes, VoL. XXXV, No. 105.—May, 1863. 
48 oe 
