427 



Butter of zinc, obtained by distilling to dryness the muriate of 

 zinc, was found to consist of exactly equal parts of the two ingre- 

 dients. 



The fuming butter of arsenic was found to contain nearly 60 chlo- 

 rine to 40 arsenic. This compound has the property of dissolving 

 phosphorus when gently heated, but to part with it on being cooled. 

 It also readily dissolves sulphur when warmed, and yields crystals of 

 sulphur by cooling. It likewise dissolves resins, oil of turpentine, or 

 olive oil ; and in these respects resembles the compounds of sulphur 

 or phosphorus with chlorine, which have the same property of en- 

 tering into combination with fixed and volatile oils. 



In this respect also the butter of antimony was found to agree with 

 the same compounds ; and in the proportion of its constituent parts, 

 to be as nearly as possible the reverse of the preceding. 



It is remarked concerning these compounds, in general, of metals 

 with chlorine, that their volatility or fusibility are in no degree cor- 

 respondent to the qualities of the metals of which they consist. One 

 of the compounds of iron, for instance, is volatile ; but those of bis- 

 muth, zinc, and lead, are even less fusible than the metals themselves. 



In order to correct the preceding analysis, the author has had re- 

 course to the general analogy of definite proportions ; and since one 

 of hydrogen unites with 7'5 oxygen, or with 33'6 chlorine, the com- 

 pounds of chlorine have been compared with the oxides of the same 

 metals ; and in the instances of copper, iron, zinc, and arsenic, have 

 been found to agree correctly with the analyses of oxides by other 

 chemists ; and where such agreement has been wanting, it has been 

 obtained by new analyses of the oxides of tin, lead, antimony, and 

 bismuth. 



In making similar comparisons of the compounds of the same me- 

 tals with sulphur, four instances of correspondence were found in tin, 

 lead, antimony, and bismuth ; but others were observed not to ac- 

 cord with the proportions assigned. 



The author concludes with observing the degree of analogy that 

 subsists between the oxides of metals, and their compounds, with 

 chlorine ; horn silver, resin copper, horn lead, and corrosive sub- 

 limate, being each soluble in excess of muriatic acid, although 

 the last is even less soluble in nitric or sulphuric acids than in mere 

 water. 



Further Experiments and Observations on the Action of Poisons on the 

 Animal System. By B. C. Brodie, Esq. F.R.S. Communicated to 

 the Society for the Improvement of Animal Chemistry, and by them 

 to the Royal Society. Read February 27, 1812. [Phil. Trans. 1812, 

 p. 205.] 



In the description of the author's former experiments on the same 

 subject, he entered more into the detail of particular occurrences than 

 he now thinks necessary. He was formerly apprehensive that the 

 operations of the same poison might not be always the same, and was 



