At Dracot Cerne there is belemnites, as also at Tytherington Lucas. They are like hafts of knives, dimly transparent, having a seame on one side. West from Highworth, towards Cricklad, are stones as big, or bigger than one’s head, that lie common even in the highway, which are petrified sea-mushromes. They looke like honeycombs, but the holes are not hexagons, but round. They are found from Lydiard Tregoze to Cumnor in Barkshire, in which field I have also seen them. [See page 9.—J. B.] At Steeple Ashton are frequently found stones resembling the picture of the unicorne’s horn, but not tapering. They are about the bignesse of a cart-rope, and are of a reddish gray colour. In the vicaridge garden at Bower Chalke are found petrified oyster shells; which the learned Mr. Lancelot Morehouse, who lived there some yeares, assured me: and I am informed since that there are also cockle shells and scalop shells. Also in the parish of Wotton Basset are found petrified oyster shells; and there are also found cornua ammonis of a reddish gray, but not very large. About two or three miles from the Devises are found in a pitt snake-stones (cornua ammonis) no bigger than a sixpence, of a black colour. Mr. John Beaumont, Junr., of Somersetshire, a great naturalist, tells me that some-where by Chilmarke lies in the chalke a bed of stones called “echini marini”. He also enformes me that, east of Bitteston, in the estate of Mr. Montjoy, is a spring,-they call it a holy well,-where five-pointed stones doe bubble up (Astreites) which doe move in vinegar. At Broad Chalke are sometimes found cornua ammonis of chalke. I doe believe that they might be heretofore in as great abundance hereabout as they are about Caynsham and Burnet in Somersetshire; but being soft, the plough teares them in pieces; and the sun and the frost does slake them like lime. They are very common about West Lavington, with which the right honourable James, Earle of Abington, has adorned his grotto’s there. There are also some of these stones about Calne. CHAPTER VIII. AN HYPOTHESIS OF THE TERRAQUEOUS GLOBE. A DIGRESSION. [THE seventeenth century was peculiarly an age of scientific research and investigation. The substantial and brilliant discoveries of Newton induced many of his less gifted contemporaries to pursue inquiries into the arcana and profound mysteries of science; but where rational inferences and deductions failed, they too frequently had recourse to mere unsupported theory and conjectural speculation. The stratification of the crust of our globe, and the division of its surface into land and water, was a fertile theme for conjecture; and many learned and otherwise sagacious writers, assigned imaginary causes for the results which they attempted to explain.