222 MEMOIR OF DR. DALTON, AND 



between the oxides of iron of the south and those of the 

 north. The cinnabar of Japan has the same proportions as 

 that of Almaden. Silver is neither oxidated nor muriated 

 diflferently in the muriate of Peru from the muriate of Siberia. 

 In no part of the known world will you see two muriates of 

 soda, two muriates of ammonia, two saltpetres, two sulphates 

 of lime or of potash, soda, magnesia, or baryta, which are 

 different; in fine, it is with one measure that all the com- 

 binations of the globe have been formed." 



Page 370. " Nature has imposed certain laws of proportion 

 in relation to those unions which we have come to call combi- 

 nations." 



Vol. Ixiii., page 439. 



" None of the researches which have been undertaken 

 hitherto to assist the hypothesis of variable oxidations, even 

 among the class of nonmetallic combustibles, have been able 

 to discover above one or two of each ; and each of these 

 once oxidized is equally a product, the characters of which 

 are invariable, preserving its properties with firmness on all 

 occasions where they can be shown, whether free or in a state 

 of combination. To this height are we now arrived in this 

 branch of natural science." 



Page 466. " There is nothing whatever in opposition to our 

 extension of the same principles by regarding the solutions of 

 sulphur, phosphorus, carbon, arsenic, zinc, &c., in hydrogen, 

 not as simple solutions, without measure, in unfixed propor- 

 tions, but as proportional combinations, as hydrurets of sul- 

 phur, phosphorus, &c., which the excess of the solvent may 

 take into solution." 



" Sur les Sulfures Metalliques." 



Jour, de Ph., vol. lix., page 261, year 1804. 



The following is a portion of the controversy between 

 Berthollet and Proust. It begins with quotations from 

 Berthollet. 



" He (Proust) believes that there is attached to antimony 



