consists of eight luminous octants alternately polarized in a different 

 manner ; and observes, that if we knew in what way the halo is 

 formed, there would probably be no difficulty in explaining these re- 

 markable phenomena. 



On an ebbing and flowing Stream discovered by boring in the Harbour 

 of Bridlington. By John Storer, M.D. Communicated by the Right 

 Hon. Sir Joseph Banks, Bart. K.B. P.R.S. Read January 19, 

 1815. [Phil. Trans. 1815, p. 54.] 



In the year 1811, with a view to making certain improvements in 

 the port of Bridlington, an examination was made of the depth of a 

 stratum of clay, and another of gravel, at some distance below high- 

 water mark. At low water the harbour is dry, and at high water it 

 has from fifteen to seventeen feet of water in the deepest part. The 

 spot fixed upon for boring, has about six feet of water in ordinary 

 tides. 



After boring through 28 feet of clay, and subsequently through a 

 mixed stratum of chalk and gravel, the augur was found to strike 

 against a solid rock, on which that instrument could make no im- 

 pression, and the work was discontinued, without any appearance of 

 water at that time rising in the bore. But in the course of an hour 

 or two it was observed to be filled to the top with very limpid fresh 

 water, which, after a short time, was projected some inches above 

 the summit, in a stream equal to its calibre. As the water was found 

 to be fit for washing, and all culinary purposes, the bore was first 

 secured by an elm stock ten feet long, and perforated with a three- 

 inch augur, through which was passed a copper tube of the same 

 diameter, well tinned to the depth of 32 feet, and which thus reached 

 from the bottom of the elm stock to the solid rock, in order to pre- 

 serve a supply of water for the use of the town. 



The stream, however, is found not to be constant, but to cease re- 

 gularly when the tide has fallen to a certain distance, and not to flow 

 again till the tide returns to the same level, its force increasing regu- 

 larly as the tide advances ; and it may be observed to be propelled 

 with much force, even after the bore is overflowed by the tide. By 

 attention to the height of the tide at the time that the water begins 

 to flow, it is found to be very regularly 49 or 50 inches below the 

 level of the top of the bore, excepting after any very unusual fall of 

 rain, when the water has been known to flow even when the tide has 

 fallen as much as eight feet below the top of the bore. 



These appearances, says the author, seem not to admit of any sa- 

 tisfactory explanation, without supposing some subterraneous com- 

 munication between the water of the sea and thr,t of the spring ; and 

 Mr. Milne, under whose direction the work has been conducted, con- 

 ceives the stratum of clay, through which the water issues, to extend 

 over the whole bay in front of the harbour, as far as to Smithwick 

 Sand, which is known to be supported by a ledge of rock that has 

 an almost perpendicular face, and very deep water beyond it. It is 



