132 THE ATOMIC WEIGHTS. 



GLUCINUM. 



Our knowledge of the atomic weight of glucinum is chiefly derived 

 from experiments made upon the sulphate. Leaving out of account the 

 single determination by Berzelius, * we have to consider the data fur- 

 nished by Awdejew, Weeren, Klatzo, Debray, Nilson and Pettersson, and 

 Kriiss and Moraht. 



Awdejew, f whose determination was the earliest of any value, analyzed 

 the sulphate. The sulphuric acid was thrown down as barium sulphate ; 

 and in the nitrate, from which the excess of barium had been first re- 

 moved, the glucina was precipitated by ammonia. The figures which 

 Awdejew publishes represent the ratio between S0 3 and G10, but not 

 absolute weights. As, however, his calculations were made with S0 3 = 

 501.165, and Ba probably 855.29, we may add a third column showing 

 how much BaS0 4 is proportional to 100 parts of G10 : 



SO S . GIO. Ratio. 



4457 !4o 921.242 



4531 1420 9 2 7.304 



7816 2480 9 I 5-93 



12880 4065 920 814 



Mean, 921.316, LS77 



The same method was followed by Weeren and by Klatzo, except that 

 Weeren used ammonium sulphide instead of ammonia for the precipita- 

 tion of the glucina. Weeren J gives the following weights of GIO and 

 BaS0 4 . The ratio is given in a third column, just as with the figures by 

 Awdejew : 



GIO. BaSO. Ratio. 



.3163 2.9332 927.031 



.2872 2.6377 918 419 



.2954 2.7342 9 2 5-592 



.5284 4.8823 902.946 



Mean, 918.497, =b 3.624 



Klatzo's figures are as follows, with the third column added by the 



writer : 



GIO. BaSO. Ratio. 



.2339 2.1520 920.052 



.1910 J-7556 919.162 



.2673 2.4872 930-49 



3585 3-3"5 9 2 3.7io 



.2800 2.5842 922.989 



Mean, 923.281, 1.346 



* Poggend. Annal., 8, i. 



t Poggend. Aiinal., 56, 106. 1842. 



t Poggend. Aiinal., 92, 124. 1854. 



g Zeitschr. Anal. Chem., 8, 523. 1869. 



