\ 
On Ebbing and Flowing Springs. 267 
Taste showing the Angle between two Cuts with its natural 
versed Sine from 9 to 32. 
| Angle. V. Sine. | Angle. V. Sine. 
— | -—_— SS 
} 
9/40 0 |-233956 | 31 | 11 36-79 |-020470 
10| 36.0 }-190983 | 32] 11 15- |-019215 
11 | 32 43-63|-158746 || 33 | 10°54-55|-018071 
12130 0. |-133975 | 34 | 10 35-291-017027 
13 | 27 41:54]-114544 | 35 | 10 17+14]-016070 | 
14 | 25 42-86/-099031-| 36110 0 |-015192 
15 |.24 -0) -|-086454 || 37 43-78|-014384 
16 | 22 30 |-076120 | 38 28-42 |-013639 
17 | 21 10-59|-067528 || 39 13°85 |-012950 
18 | 20 0  |-060307 | 40 0  |-012312 
19 | 18 56°81] -054183 46-83 |-011720 
20/18 0 |-048943 || 42 34-28 |-O11169 
21.117 §-57|-044427 || 43 22-33 |-010657 
199 | 16 21-82|-040507 | 4: 10:91 |-010179 
93 | 15 39:09|-037083 |) 45 0 |-009732 
24/15 0 |-084074 | 49-56 |-009314 
25 | 14-24 |-031417 | 47 3-57 |-008923 
96 | 13 50-77 |-029038 | 30° }-008555 
27 | 13 20: |-026955 || 49 20-82 |-008210 
98 | 12 51-43|-025072 || 50 12° |-007885 
29 | 12 24-83}-023379 || 51 3-53 |-007580 
30112 0 |-021852 |) 52 -39| 007291 
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W. Apamson, Ebury-street, Five-fields, Chelsea, 
August 20, 1817. 
XLIV. On Ebbing and Flowing Springs; with Geological 
Remarks and Queries, By A Correspondent. 
To Mr, Tilloch. 
Sin, — Ix the Number of your Magazine for August, Mr. Inglis 
seems to have satisfactorily accounted for the ebbing and flowing 
spring of fresh water at Bridlington quay, by the pressure of the 
sea upon a stratum of flexible clay which divides the fresh from 
the sea water. 
His assertion that this bed of clay extends to the Spurn Point 
is probably correct; but he is not so, in supposing that it will be 
found to rise and fall with the ebbing and flowing of every tide ; 
at least that effect is not produced in the neighbourhood of Hull, 
at 
