632 SCIENTIFIC RECORD FOR 1383. 



Dithium. — D. Toramasi, on purely theoretical grounds, thinks the ato- 

 mic weight of Lithium in its compounds is double that which it possesses 

 in a free state. He proposes for lithium chloride the formula LiCl 2 , 

 bringing the metal into the family group Ba, Sr, and Ca, with wbich, 

 in its compounds, it certainly bears many analogies. (Cosmos, les mon- 

 de^ No. 2, 1883.) 



Ghtcimim. — By determining anew the specific heat of metallic gluci- 

 nutn, Dr. T. S. Huinpidge obtained the figures 0.4455, and this gives 

 an atomic weight =13.G5 instead of 0.1, as usually assigned. (Chcm. 

 News, xlvii, 181.) 



Humpidge's results have been questioned by Dr. J. Emerson Keynolds, 

 who shows that the material used by Humpidge was less pure than that 

 uaed by Messrs. Nilson and Petterson. He thinks that the weight of evi- 

 dence is in favor of the value 0.2 for the atomic weight, the metal being 

 a dyad. To this criticism, however, Dr. Humpidge replies in a third 

 article, maintaining the purity of the material used and rejecting Rey- 

 nolds' views as to the valence of the element. ( Chem. News, xlvii, p. 207.) 



Titanium,. — The atomic weight of titanium has been carefully revised 

 by Prof. T. E. Thorpe, who obtained as a mean of nineteen determina- 

 tions Ti=48.00. (Chem. Neics, xlviii, 251.) 



Manganese. — Professors James Dewar and Alexander Scott, of Cam- 

 bridge, England, have redetermined the atomic weight of manganese, 

 and obtain as a mean of eight experiments the value 55.038 when O = 

 16 and Ag = 107.03. The methods employed were the reduction of sil- 

 ver permanganate by hydrogen (which, however, was unsatisfactory), 

 and the reduction of the same salt by sulphurous acid, sodium formate, 

 or potassium nitrite, and subsequent titration of the silver with dilute 

 potassium bromide. (Chem. J¥eics, xlvii, 08.) 



Marignac has also redetermined this constant, obtaining Mn = 55.07. 

 (Archives des sci. phys. nat. (3), X, 5.) 



Antimony. — Bongartz has recently estimated anew the atomic weight 

 of antimony by the method proposed by Classen. The average of twelve 

 experiments was 120.103, which very closely approximates the results of 

 Schneider and of Cooke. (Ber. d. chem. Ges., xvi, 1042.) 



Additional Redeterminations of Atomic Weights. 



Nickel : Ni=5s.75 by Baubigny. (Comptes rendus, xcvii, 051.) 

 Copper: Cu=G3.46, by Baubigny. (Comptes rendus, xcvii, 006.) 

 Tellurium: Te=125.0 by Brauner. (Ber. d. chem. Ges., xvi, 3055.) 

 Bismuth : Bi=208.16 by Marignac. (Archives des sci. phys. nat. (3), x, 



5.) Also by Lowe, who obtained Bi =207.33. (Zeitschr. anal. Chem., 



xxu, 480.) 

 Zinc : Zn=05.29 by Marignac. (Archives des sci. phys. nat. (3), x, 5.) 

 Magnesium : Mg=24.37 by Marignac. (Archives des sci. phys. nat. 



(3), x, 5.) 



