434 Sensible and Convenient Method [Dec. 



4. Willi the above exception, they are also detailed in the Journal 

 de Physique, l~$8 ; Sage's memoir having been also printed in that 

 work, u ith some alterations. 



5. These facts are all mentioned by Klaproth, in CrelPs Annals r 

 1795. 



6. The solubility of sulphate of barvtes in sulphuric acid, and the 

 decomposition of the solution by water, are stated by Kirwan : 

 Mineralogy, vol. i. p. 136, 1 794. 



7. The experiments alluded to are all described with such perfect 

 clearness by Klaproth, that I shall quote the passage from the Eng- 

 lisfa translation, vol. i. p. '234, printed in London in 1 SO], the 

 year before that in which Mr. Hume's paper was published. 



After describing the solution of strontian in sulphuric acid, as 

 already quoted, he adds, " In like manner, 60 grains of wilherite 

 were combined with two ounces of strong sulphuric acid. A great 

 effervescence ensued ; and, with the assistance of boiling heat, a 

 complete solution as clear as water was likewise in this case pro- 

 duced. Some days after, the greatest part of this solution formed a 

 crystalline mass of very tender fibres. This solution was also im- 

 mediately decomposed by the admixture of water, and sulphate of 

 barytes precipitated." 



The pages of the Annals of Philosophy , the Philosophical Maga- 

 zine, and the Medical and Physical Journal, exhibit ample evidence 

 of Mr. Hume's proneness 10 complain without having been injured, 

 and to attack under semblance of defence : in future he will pro- 

 bably be more cautious ; and, considering his situation with respect 

 to the authors I have quoted, it will evince his prudence to refrain 

 from charging those who may hereafter even unfairly question the 

 priority of his remaining or future discoveries, with the conduct 

 unmeritedly ascribed to two most respectable physicians, of a un- 

 justly throwing the veil over his efforts, in order to display their 

 own."* 



Article VII. 



Description of a sensible and convtfiient Method, which serves as & 

 Magnetometer. By W. A. Lampadius.f 



To procure an easy and convenient instrument to determine the 

 weight of small quantities of matter, and to ascertain the smallest 

 change in the weight of bodies under examination, 1 employed the 

 following method, which serves likewise the purpose of a magneto- 

 meter, and may be employed for other hygroscopical and similar 

 purposes;: — 



* Vide Med. and Phys. Journal, vol. xxvi. n.. 109. 



r Translated from Schweiggcr's Neucs Journal fur Cliemie uud Puvsik, x. 171. 

 1*14. 



