VOL. XVII.] PHILOSOPHICAL TRANSACTIONS. ,437 



contained in the arteria pulmonalis. I observed moreover blood coagulated after 

 a very different manner (which I want words to express) from what I have seen 

 at any other time, notwithstanding the various methods I had used to coagulate 

 it, and this in the interstices between the columnae of the aforesaid ventricle ; 

 and in this a greater quantity of quicksilver than any where else in the dog. 

 This coagulum was in the vertex of the ventricle, adhering pretty closely to the 

 columnae and parietes. 



Opening the left ventricle, I found a very tenacious blood coagulated, and 

 sticking firmly to the great valve, including the tendons of it, and a little re- 

 sembling a polypus. In this ventricle I searched diligently for mercury, but 

 found none ; whence it may appear, that the mercury passed no farther than the 

 extremities of the arteria pulmonalis : this occasioned the aforesaid blisters, and 

 forced its way through the common coat of the lungs, partly by its weight, and 

 partly by the propulsion of fresh blood to the same extremities, which by the 

 mercury was stopped in its motion, and consequently forced its passage through 

 that which most readily gave way, namely the common coat of the lungs. 



I opened the aspera arteria down to the very bronchia, but could find no 

 mercury in it, though I searched diligently for it. Each of the subdivisions, as 

 well as divisions, of the bronchia, was filled with a sanies, which when I washed 

 away, I found globules of mercury in many places under the bronchia, and on 

 examination they proved to be in the arteria pulmonalis. I have pressed these 

 globules backwards and forwards, and made some of them get out at the holes 

 made in the vesiculae above described. I took some pains to find where the 

 sanies was received into the bronchia, but could not satisfy myself. From hence 

 may appear the danger of using mercury in human bodies, so as that it may 

 get into the mass of blood, especially into the lungs ; as they want that brisk 

 strong motion which the muscles have in other parts, which are able to force it 

 along with the blood, in order to the raising a salivation. Their lax spongy 

 texture makes them extremely unfit for clearing themselves of so troublesome a 

 guest as mercury is. That it has this effect on human lungs, is plain from what 

 we daily see in persons that have been often fluxed, who are after observed to die 

 of consumptions, which will not yield to medicine. 



Medicina Hydrostatica, or Hydrostatics applied to the Materia Medica, showing 

 how by the Weight that divers Bodies used in Physic have in IValer, one may 

 discover whether they be Genuine or Multerate. By the Hon. Robert Boyle, 

 F.R.S. Lond. &V0. iQQO. N° 192, p. 488. 

 The honourable author designs in this treatise to show, that by weighing 



bodies in water, comparing their weight in air, and from thence deducing the 



