( 545 ) 



WcL!," aiidculeii, ;iut" \\(>lclieni die Lrtsiuig- dcs vorliogeiideii llütscls z,u 

 8 lichen sei?" 



3. We UaxQ not oidy i-epoated (he research of Popper but also 

 exleiided Ihe same hy iisiiiti; liydrochloric acid solutions of >Sl)Cl3, 

 Avhose concentration varied between 2.3 and 83.3 [)ercents of .SbClg by 

 \vei<2,ht. 



ll was necessary (o pay parlicidai' attention to the purity of Ihe 

 materials ein[)loyed. The anlimoiiy trichloride was obtained from 

 Mkhck; 20 grams were dissohed in sohilioii of pure tartaric acid 

 and then digested on the waterbalh for some iionrs with excess of 

 (dear sodium snlphi(h'. The li(piid remained jx.'rfectly clear'). 



Some kilos of lliis aniimony (•hh)ri(h' wore precipitated with sodium 

 carbonate I'vql' from foreign metals, the precipitated Sii.^ (), was washed, 

 drietl and reduced to metal by fusion wilh pure |)olassium cyanide 

 in a P|',ki{ot"s furnace, 'fhe ci'ueibles used were j)r<>\iousIy tested to 

 see whether they woidd yield any foreign melal to |)otassiuni cyanide 

 but we could not pi-oxc llie presence ot any im|»urity in Ihe melt. 



') A.s commercial antimony generally contain.s lead whose atomic weight exceeds 

 tJial of antimony it wa.s absolutely necessary to prevent the possibility ut' any lead 



IteiuL;- [icscnt in till' materials enijiioved. 



