Lectures on the materia medica: containing the natural history of drugs, their virtues and doses: also directions for the study of the materia medica; and an appendix on the method of prescribing Published from the manuscript of the late Dr Charles Alston .. by John Hope ... . ow dulcified again by the fameprocefs, and the like ; it will not be difficult for you to determine how manyof the preparations are ufeful, and how many may be wanted ; and how far,and why, the calomel is preferable to the powders and pills made of quick-filver, efpecially when a falivation is defigned. And I hope you wi
Lectures on the materia medica: containing the natural history of drugs, their virtues and doses: also directions for the study of the materia medica; and an appendix on the method of prescribing Published from the manuscript of the late Dr Charles Alston .. by John Hope ... . ow dulcified again by the fameprocefs, and the like ; it will not be difficult for you to determine how manyof the preparations are ufeful, and how many may be wanted ; and how far,and why, the calomel is preferable to the powders and pills made of quick-filver, efpecially when a falivation is defigned. And I hope you will neverforget that mercury, as all great medicines are, is an edged tool, and to beufed with caution, more efpecially when it is in any quantity to be lodged inthe body : for if any one attempts to raife a falivation, without knowing howto prepare the patient for it ; how to prevent the medicines going off byflool, &c. how fupervenient fymptoms are to be remedied ; what length onemay fafely go, both as to the quantity of the mercury, and of the faliva, andthe like ; he may ruin his patient and his own reputation at the fame Geoffrey has more than feven pages on falivating ; but I believe few willfollow his directions. Beware of his reafonings. O 2 LECTURE. LECTURES ON THE LECTURE XVII. Led. i j. I. PLUMBUM, Saturnus offic. Plumbum nigrum, Fallop. defoffil. c. 322. Worm. Muf. 124. Plumbum, Dak 36. Geoff, i. 271, &c. is a very fofc and heavy metal, of a livid colour, found in ores,, fromwhich it is refined, (a) Lead is ro water in weight as 11345 to 1000. (/3)It is the fofteft and lead: founding of all the metals; melts before it growsred, and with lefs heat than any except tin. (c^) Is not very fixed in the fire,eafily turning to a calx, and calcining other fubflances with it. Vid. B. p. 37. Cramer. Docim. i. p. 5, & 21. It is found in many countries, and ingreat plenty in Britain, fometimes near the furface of the earth, fometimes
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