Experiments and observations upon oriental and other bezoar-stones : which prove them to be of no use in physick. Gascoin's Powder, distinctly Examin'd in its Seven Ingredients, Censur'd, and found Imperfect. Dedicated to the Royal Society. To which is annex'd, A vindication of sugars against the charge of Dr. Willis, other Physicians, and Common Prejudices. Dedicated to the Ladies. Together with Further Discoveries and Remarks. By Frederick Slare, Fellow of the College of Physicians, and of the Royal Society