Extracts from Berzelius^s Annual Report for 1843. 189 



of chlorine, from which results the new compound (C2*^H^*CP°). 



Three analyses of which gave 



Carbon, 39-47 39-41 39-39 



Hydrogen, 2-31 2-30 2-33 



Chlorine, 58-22 58-29 58-28 

 The following numbers represent those derived from calculation with 



the various numbers proposed for chlorine. ' 



Carbon, 



Hydrogen, 



Chlorine, 



It is seen from this that only those numbers which have been obtain- 

 ed by means of the old atomic weight, accord with the results of the 

 analysis. 



M. Marignac (Ann. der Chem. und Pharm., XLIV, 11) recommen- 

 ced his experiments upon this subject, following a different process 

 from the one he originally adopted ; his experiments would occupy too 

 much space to detail, and we refer those curious upon this subject 

 to the Annual Rapport, or to the original article itself. The result of 

 these last experiments has been 442-198 as the equivalent of chlorine. 



Atomic Weight of Potassium. — M. Marignac, in the experiments 

 just alluded to, determined the atomic weight of Potassium to be 

 489-954. 



Atomic Weight of Calcium. — M. Dumas (Jour, fiir Pr. Chem. XL VI, 

 460) has tried to prove that the atomic weight of calcium is a multiple 

 of that of hydrogen, and the result of his experiments is that it is 

 twenty times that of hydrogen or 250. M. M. Erdmann and Marchand 

 have confirmed the accuracy of the result. BerzeUus in his report en- 

 ters into some detail as to what may be the inaccuracy attendant upon 

 such experiments, as were made by those gentlemen, and gives as the 

 result of some recent experiments of his 251-942 as the atomic weight 

 of calcium. 



Atomic Weight of Glucinium. — From the experiments of M. Awde- 

 jew, and those of the Count Schaffgotsh, M. BerzeUus concludes that 

 the atomic weight of glucinium is 87-124, and that its equivalent is two 



atoms or 174-28, glucina being represented by G'zr:474-28. 



Atomic Weight of Silver. — M. Marignac in determining the atomic 

 weight of chlorine ascertained also that of silver, which he concludes 

 to be 1350 and not 1351-6. 



Atomic Weight of Uranium. — According to M. Peligot (Ann. de 

 Chim. et de Phys. V, 547) it is 750. M. Ebelmen makes it 742W5. 

 M. Wertheim 740-512. 



