490 PHILOSOPHICAL TRANSACTIONS. [aNNO 1709- 



bone, which occasioned his consulting some physicians, one of which suspected 

 the bullet. At length the tumours coming to the throat, if he held up his 

 head a little, it seemed as if one with a hook pulled down the jaw-bone; and 

 if any thing touched the throat, it was as painful as if pricked with many 

 needles. Being at last persuaded to make some applications, a small hole ap- 

 peared, after that another, and then a third, near the pomum adami; by these 

 the bullet was discovered, and cut out in August 1672. 



An Account of Books ; viz. I. Pnelectiones Chymicce OxonioP habitce a Johanne 

 Freindy M. D. JEdis Christi Alumno. N° 320, p. 31 9. 



The learned author of this treatise, without considering the principles and 

 errors of former chemists, endeavours to give a clear and easy account of the 

 chief operations of chemistry from the true principles of natural philosophy, 

 and chiefly that of attraction; which, he says, is no figment or hypothesis, 

 but deduced from many plain experiments, and grounded on the laws of nature 

 and that relation that is found among bodies, but particularly from the obser- 

 vations that are to be made in chemistry itself. And because chemistry is an 

 art of joining bodies that are separated, or separating such as are joined, he 

 divides the operations of chemistry into two sorts; viz. such as disunite the 

 parts of bodies from one another, and such as compound or mix them together. 

 The chemists not agreeing what are to be put in the second class and what in 

 the first, he follows a new order, and among the first class he reckons calcina- 

 tion, sublimation, and distillation; in the second are ranked fermentation, di- 

 gestion, extraction, precipitation, and crystallization. 



His design in this treatise is to explain first, the method of each operation 

 according to this order, and the mechanical force by which it is produced. 

 Secondly, the different ways by which it commonly is, or may be performed : 

 and thirdly, he gives many particular experiments, which he explains and 

 reduces to the general theory laid down at first. Accordingly we have here the 

 reason of the cohesion of bodies, which he draws from the principle of attrac- 

 tion, and the quantity of contact ; the causes of fluidity and liquation ; the 

 reason why some bodies, as wax and metals, being melted in the fire, and after- 

 wards cooled, do return to their first form, whereas others by fire acquire a 

 new form : how it happens, that the absolute weight of bodies is generally 

 after calcination increased, and the specific gravity diminished. We have also 

 the reason, why fluids rise in an alembic; and he shows that if a globule of 

 water be so rarefied, as to have its diameter made only ten times greater, it 

 will become lighter than the air, and consequently must rise up in it: but if 

 the diameter be increased in the proportion of 12 to 1, the bubble of water 



