( 548 ) 



To (leteriniiic llie aiiiuuiil (tf aiiliuioiiv sopanitecl hv the ciirrciir 

 the following method was adojitcd '). 



The rod was phiced in a lube of liard Jena glass closed at one 

 end (length of the tube 30 em., diameter 1 em.). This lube had 

 been previously cleaned, strongly heated in a current of drv air 

 (dried over H„ SO^ and P., 05) and then weighed. The antiiuony 

 rod was now weighed and by way of control the tube and rod 

 were again weighed together. 



The air from the tul)e was now expelled by means of a continual 

 stream of carbon dioxide which had l)een dried over sulphuric acid 

 and ])hosi)horlc anhydride. The tube {e.vplo.sion-iiihe) was tiien closed 

 with a properly titling india-rubber cork and put into a metal cooling 

 vessel made of composition tube in the maimer rei)resentetl in tig. 2. 

 This lube was comiected with the water tap. 



If now the explosion tube is shaken for a moment the explosive anti- 

 mony explodes. The tube is then sti'ongly heated with a trii)le bui-uer 

 on the spot containing the rod : the Sb V\^ evolved condenses on the cold 

 wall of the tube to a clear white mass. The heating is couiiuiicd 

 until the antimony is perfectly fused and this is then allowed to cool 

 slowly. The tube is then opened, the Sb CI, is removed l)y rinsing 

 with a uiixlure of alcohol and ether (3 : 1) the tube is then rinsed 

 with elhei' and (b'ied by heating in a current of dry aii' as described 

 abo\e. 



The tube willi the antimony regubis is now weighed. 



A ]n-evious (v\|)eriineut had proxed that the explosion tube sutlers 

 no allcratiou in wciuhl by the heating and subsequent treatment. 

 It was found for ijisiauce that an explosion tube weighed 21).()()i4 

 gram i)elore the expei-imeut an<l 21l.()()J() gram after the ex|»eriment 

 the contents ha\ing l)een i'(Muov(*(1 by means of nitric and tai-lai-ic 

 acids. 



\\\ WAX of illustration one of the experiments is repi-odiiced in 

 detail Avhilst the results of the other measurements are nnitcd in 

 a table. 



Electrolysis of a 15.(3 j)roc. SbCl., solution. 



Silver coulometer X". 1. 



weight of plaliinim dish -|- silver 73.1920 grams 



// // // 36.7310 „ 



weight of silver 36.4610 griims 



1) Further paiticulars al)Out tliis mefliod will l)e found in the pa|)fr of Cohen 

 and Dr. Ringer. 



