Sylva, or, A discourse of forest trees, and the propagation of timber in his majesty's dominions, as it was delivered in the Royal Society the 15. of October, 1662, upon occasion of certain quaeries propounded to that illustrious assembly, by the honourable, and principal officers and commissioners of the navy. In two books ; together with an historical account of the sacredness and use of standing groves ; Terra, a philosophical essay of earth; being a lecture in course ; to which is annex'd Po