GLUCINUM. 97 



offer only theoretical discussions of the subject ; Reynolds 

 and Nilson and Pettersson have determined the specific 

 heat of the metal, but give opposed results. In the follow- 

 ing calculations the simpler formula will be assumed, not as 

 a finality, but because of its accordance with the system of 

 Mcndelejeft'. 



The data from which we are to calculate the atomic 

 weight of glucinum have been determined by Awdejew, 

 Weeren, Klatzo, Debray, and Nilson and Pettersson. Ber- 

 zelius'* single experiment on the sulphate may be left out 

 of account. 



Awdejew, t whose determination was the earliest of any 

 value, analyzed the sulphate. The sulphuric acid was 

 thrown, down as barium sulphate ; and in the filtrate, from 

 which the excess of barium had been first removed, the 

 glucina was precipitated by ammonia. The figures which 

 Awdejew publishes represent the ratio between SO 3 and 

 GIO, but not absolute weights. As, however, his calcula- 

 tions were made with SO 3 = 501.165, and Ba probably = 

 855.29, we may add a third column showing how much 

 BaS04 is proportional to 100 parts of GIO : 



Mean, 921.316, ± 1-577 



The same method was followed by Weeren and by Klatzo, 

 except that Weeren used ammonium sulphide instead of 

 ammonia for the precipitation of the glucina. Weeren| 

 gives the following weights of GIO and BaS04. The ratio 

 is given in a third column, just as with the figures by 

 Awdejew : 



*Poggend. Annal., 8, i. 



f " 56, 106. 1842. 



X " 92, 124. 1854. 



