( 553 j 



Wei«'he(l (|iiaiililios of a sail were, lli('r(^r(>ro, siicccssiNcly dissolvod; 

 on account vi' Iho ni)a\(ü(lal)l(' crrois in Avoiiiliijiii' it \vas (lilïlciilt to 

 experiment willi vei-_v dilulo solutions of acciii-alelv known ('oni|iosili())i, 

 hnl hy evaporatinij,- a measured (|uanlity of a very diliHe a(|U(M)u.s 

 solution in a pipette^ which was then i'ins(Ml with the hxdrazine we 

 have reached for KCl a coneenlration of 1^^= + 900. 



In view of the ahove we wish to remark ucneralU' that our 

 results cannot lay elaiui to vei-y great accuracy, allhouuh they (piilc 

 suflice even from a (piantitative point of view, to proNc that free 

 liydrazine has a strong ionising ])ower comparable with tiial of water. 



We ha\e worked with solutions of II^O, KCl, KlJr, and K.I aud 

 made a few experiments with a solution of Na and H.,N in N,^ JI^. 



In the tirst experiment the six dillerent fractions of the hydrazine 

 had not heen kept sepai'ate; as avc liad pi'eviously foimd ') that the 

 nieltingpoints of the second ami fourth fractions were the saiue we 

 thought we might conclude that at least the middle fractions were 

 similar. It then appeared, however, that the eojiductive power of 

 the bases taken from dillerent tubes often showed appreciable 

 differences. 



For this reason a second preparation was made and the liydrazinc 

 of eacli fraction (each time collected in several tubes) was examined 

 se[»arately as to its coiiducli\e [)ower. From the following ligiires it 

 ap[)ears that the eonduetixc [tower gi-adually decreases aud is smallest 

 for the last fraction. 



fraction n». 2 k at 25°= 18.1. Kr' 



3 12.8 „ 



4 11.2 „ 



5 10.0 „ 



6 (5.5 „ 



We do not know ^\ hat inipni-ity (in any case very small) is the 

 cause of this; |)ossibly we are d(\ding here; with a minute (piaiitity 

 of ammonia which is [>resent in lai'gcsl amount in the lii-st fractions 



The smallest couducti\e j)o\vei" obserxed by us in any fraction 

 prepai'cd previously was 4c.l()~'\ 



Our experiments have been mostly conducted with fraction X". G 

 of the above-mentioned quantity. 



dried in the air may occlude such an appreciable amount of oxygen that this 

 must make its infhience felt when working wiüi readily o.xidisahle li((ui(ls. Such 

 appeared to be the case when filling our ajtparatus with hydrogen when a spont- 

 aneous deposit of visible drops of water was formed. 



~) Prepared from air and phosphorus. 



1) 1. c. p. 177. 



