ISIS.] " of the Water of the Dead Sea, 



135 



With regard to the proportions which the several salts of the 

 Dead Sea bear to each other, and the considerable differences 

 which our conclusions exhibit in that respect, it is a subject 

 upon which those who may have leisure to peruse and compare the 

 two papers can form an opinion. I confess that the great care I 

 bestowed on my analysis gave mc some confidence in the re- 

 suits;* but the question of accuracy, as to the minute proportions 

 of the salts of the Dead Sea, is of too little consequence to 

 science to require any further discussion. It is only the 

 analytical methods which 1 have thought it right to vindicate | 

 and you will no doubt join me in strongly recommending to ana- 

 lysts the most scrupulous attention to the desiccation of salts. It 

 is evidently to the constant interference of water that most of the 

 apparent inconsistencies which have impeded the progress of 

 analytical chemistry are to be ascribed ; and it is only by the 

 greatest care, in removing that source of confusion, that the 

 proportions in whicii bodies unite can be well ascertained, and 

 that chemical analysis can be made to keep pace with the late 

 refined views of chemical combination. 



1 have the honour to be, &c. 



Ai.Kx. Marcet. 



Jtussel-squarCy Jan. 15, 1813. 



Article IX. 



Exposition of the Facts hitherto collected concerriing the Effects of 

 Vaccination^ and Examination of the Objections made at diffh' 

 rent Times against the Practice. Read to the Class of Physical 

 and Mathematical Sciences of the French institute, by MM, 

 Berthollet, Percy, and Halle, August 17, 1812. f 



A REPORT was read to the Institute in 1803 on this subject; 

 and a memoir on the same subject, made at Lucca in 1806, was 

 printed in their eighth volume. Now, after twelve years of 

 experiments, repeated not only all over Europe, but in every 

 part of the civilized world, we present the results deduced from 

 the comparison of a multitude of facts, often inconsistent with 



having begun to deposit crystals, I should suppose that it bad un lergone some 

 accidental evaporation. The water which I esamsned, and which had been 

 brought from the spot by Mr. Gordon, of Clunie, (and not Messrs. Gordon and 

 Clunis, as Mr. K, has hastily stated,; was perfectly free from crystals. 



* The advantage also, of having had Mr. Tennant's occa.:ional assistance In 

 forming the plan, and conducting the various processes of this analysis, increased 

 my confidence ; and this circumstance, which Mr. Klaprolh has noticed, should, 

 I think, have induced him to exaaiineihe subject with a little more attention 

 than lie seems to have done. 



+ This important paper is translatedj and in some places abridged, from tfee 

 Monitcur. 



