246 KEMARKABLE STRATA OF FLINT. 



Obfervations on which firft appears at the weft fide of St. Catharine^s, and 

 ftrau of flint whence ranging eaft ward, forms the front of the cliff, over- 

 in the Ifleof hanging the Underway dips in its fouthern face gently to the 

 ^^5^^* eaftward. The cliffs at Mirables are much higher above the 



fea than thofe at St. Laurence, and from thence they decline, 

 till at the opening of the hill above Ventnor they totally dif- 

 appear. A fmall crag juft peeps out of the eaftern face of this 

 dell, and the whole hill of St. Boniface is^ as far as can be feen, 

 compofed of chalk. As however this, like all other chalk hills, 

 is in the ftate of a fteep Hope, covered with turf, perhaps by 

 giving into its face the ftony ftratum might be difcovered. It 

 is alfo to be obferved that the chalk, which is not vifible above 

 the rock at Mirables, begins to appear foon after, and grows 

 gradually thicker as it proceeds eaftward. At St. Laurence it 

 forms a thick cap to the rocks ; and at Steephill Shute, its Ihick- 

 nefs is very much encreafed, and foon after nothing but chalk 

 appears in St. Boniface's hill. In what form the rock re-ap- 

 pears at Dunnofe to the eaft of St. Boniface, I have had no 

 opportunity of examining. 



I (liould not, dear Sir, trouble you with thefe defedive ob- 

 fervations, but that every notice, however imperfect, may be 

 of ufe when conne6ted by future obfervations, and that they 

 may ferve as a ftlraulus to other travellers, who often go over 

 this beautiful Hne of country, to turn their attention to its fin» 

 gular natural phenomena. 



I fend vou two fpecimens of the broken flints, one from 

 Brading, the other from near Caritbrook, but the tickets are 

 miflaid, and I am not fure which is which, 



I remain, &c. 

 Tilney-Street, May 26, 1 80 1 . 



III. 



- Account of a Machine for fweeping Chlmnies, by aBlafi of Aif^ 

 Jn a Letter from Mr. J. C. Hornblower, Engineer, 



To Mr. NICHOLSON, 

 Dear $ir, 



Introdufticn. J. SHALL be much obliged if you will allow me a page oi 

 two in your Journal for a defcription of a machine I have latel; 

 got up for the purpofe of cleanfing chiranies from foot, Mj 



