(4 J 



The black substance was washed with carbon disulphide and alkohol 

 and dried in a desiccator in vacuo. Ajjjiarentlv it has absorbed oxygen 

 during;- this operation for tiie analysis showed a deficit of about 13 7n- 

 We found: 78.5 "/„ P, 1.9 V H and 6.5 % X. 



When treated with dilute acids a red substance was again foi-uied 

 whicli in a|>[)earance and pj-operties corres[)onded exactly with tlie 

 one already described and contained the same amount of phosphorus 

 [found, average 92 " ,]. Tlie hydrazine has passed into the acid. 



3. From the foivgoiug it follows lliat substances quite analogous 

 to tliose formed by Sciiknck's (impure) red plios|)hoi-us and ammonia are 

 generated directly from hydrazine and yelloAv phos|»horus. Evidently, 

 the black compounds whicli ai"e formed from aipieous and anhydrons 

 hydrazine are of a different natuic ; tlicir iincstigation remains however 

 verv unsatisfact(U"v, owing to tlicir amorphous conditions and \vant of 

 tests for purity, in addition to theii' iinstability towards washing- 

 liquids. But it is ])retty cei'tain that the orange red product which 

 both yield, when treated with acids, is a weak acid composed of 

 j>liosphorus, hydrogen (and oxygen?) 



Hydrazine is therefore capable of directly gi\ in^- up hydrogen, not 

 only to sulphur but also to phosphorus. 



On/anlc c/unn. Loh. Unlrerdtij. Anistenlnm, Api-il 1903. 



Chemistry. " Tin' r/rcfromof/r,' force of the ])amei.L-(v//,s-.'" By 



.Ml-. .1. W. ('oMMKi.iN an<l Prof. Ernst Cohen. (Commimicated 

 by Prof. W. H. JiLiLS). 



(dommunicateil in the meeting of A})iil -Ji, 10U3). 



J. Ill the present state of our electro-chemical knowledge an 

 exhaustive study of the electromotive force of the I)AN!i-n.i,-cell would 

 have but little inq)ortance if it related to the use of this cell as a 

 standard-cell, as we are now in possession of standard-cells which, 

 if properly constructed, satisfy all requirements. 



We have, nevertheless nndertaken an exhaustive investigation of 

 such a cell because J. Ciialüier has published in the "Comptes 

 Rendus" ') certain views which are entirely o[)posed to our modern 

 theories on the oi-igin of the electromotive force in cells ofthiskijid. 



1) 134, 277 {\W1). 



