190 On the Atomic Weight of Glucinum. [Mar. 5, 



Curve showing specific heat of Glucinum at varying temperatures. 



vessel. The experiments were done in an atmosphere of carbonic 

 acid collected over mercury after Meier and Crafts,* and gave the 

 following results : — 



I. Glucinum Chloride. 



Substance. Displaced C0 2 . t. d. 



E periment I 26 '4 mgrms. . . 7 '47 c.c. . . . . 635° 2 733 



II.... 28-0 „ ..7'98„ .... 785° .... 2 714 



The theoretical density of Gr'C^ is 2*76, and this formula, there- 

 fore, represents the molecule of this compound.f 



II. Glucinum Bromide. 



Substance. Displaced C0 2 . t. d. 



Experiment II. . . . 35 "9 mgrms. . . 4 *28 c.c. "... 608° 6 '487 



„ III.... 61 1 „ .. 7-53 „ .... 630° .... 6 276 



„ IV.... 26-0 „ .. 3 22 „ .... 606° .... 6-245 



The density of Gl"Br 2 is 5*84, and that of Gl'"Br 3 is 876. The 

 agreement in this case is not so close as in the case of the chloride, 

 but is sufficiently near to show that the true molecular formula is 

 Gl"Br 2 , and not Gl'"Br 3 . Thus, the vapour-density of both com- 

 pounds necessitates the atomic weight 9*1. The result is a striking 

 argument in favour of the value of deductions drawn from the 



* "Berlin Ber.," xiii, 851. 



+ This result agrees with Nilson and Petterson's experiments (" Berlin Ber.," 

 xvii, 987). 



