first occasionally written, among some other essays, to a friend, and now suffer'd to come abroad as the beginning of an experimental history of colours
among which is inserted a discourse of the imperfection of the chymist's doctrine of qualities : together with some reflections upon the hypothesis of alcali and acidum
written by way of letter, to the right honorable the Lord Clifford and Dungarvan : whereunto is annext a short discourse of the atmospheres of consistent bodies
as they are wont to be propos'd and defended by the generality of alchymists : whereunto is praemis'd part of another discourse relating the fame subject
as far as it concerns Mr. R. Boyle's book of New experiments touching the spring of the air, &c. : with an appendix touching Mr. Hobbs's Doctrine of fluidity and firmness
wherein are propos'd and historically illustrated some conjectures about the consistence of the matter of precious stones, and the subjects wherein their chiefest virtues reside
to which is annext new experiments to make fire and flame ponderable : together with A discovery of the perviousness of glass : also an essay about the origine and virtues of gems
wherein are briefly treated of several subjects relating to natural philosophy in an experimental way : to which is added, a small collection of strange reports, in two parts