Page:History of the Royal Society.djvu/221

, Lignum Fossile, Blocks buried in Exeter River, Trees found under Ground in Cheshire, Lincolnshire, and elsewhere; of a Coal-Mine wrought half a Mile from the Shoar, under the Sea; of the fatal Effects of Damps on Miners, and the Ways of recovering them.

Relations of the extraordinary Strength of some small Loadstones, taking up above 150 Times their own Weight; of several English Loadstones; of the Variation of the Loadstone observ'd in two East-India Voyages, and other Places; of the growing of Pebbles inclos'd in a Glass of Water; of several excellent English Clays; of Gold found in little Lumps in a Mine in England; of the moving Sands in Norfolk.

Relations about refining Lead, and Tin-Oar; of hardning Steel so as to cut Porphyry with it, and softning it so much, as to make it easy to be wrought on; of impregnating Lead Oar with Metal, after it has been once freed; of petrify'd Teeth, and a petrify'd human Fœtus; of several Ways of splitting Rocks; of living Muscles found in the midst of Rocks at Leghorn; of the Way of making Quicksliver; of Things observable at the Bottom of the Sea; of a soft Metal, which hardens after it has taken off the Impression, and the Way of reducing such Impressions into as small a Proportion as is desired.

Relations about Agriculture; of ordering of Vines; of the setting and planting of Trees several Ways; of Elms growing from Chips, of new Trees sprung from rotten Roots; of several Kinds of Trees, growing one out of another, and in the Place of others; of the best Ways of Pruning; of making a Kind of Silk with Virginia Grass; of a Kind of Grass making stronger Ropes than the common Hemp; of a new Way of 4