266 Scientific Intelligence. 



satisfactorily explained. Is Oa likewise formed under these circum- 

 stances ? 



There still remains to examine the comprehensive field of extremely 

 interesting comparisons between the different properties of these two 

 allotropic modifications, a subject of inquiry of the greatest importance 

 for science. We have already become acquainted with the mysterious 

 statement of Leuch, according to whom Oa (galvanized air) can be 

 used with considerable advantage for bleaching purposes, and indeed 

 surpasses all other bleaching materials.* 



2. On the relations of Glycocoll and A I car gene ; by T. S. Hunt, 

 (communicated for this Journal.)— The similarity which exists between 

 the compounds of nitrogen and arsenic is such, that they are regarded 

 as belonging to the same natural group and capable of replacing each 

 other in combination. Kakodyle and its derivatives are as yet the 

 only organic bodies known which contain arsenic ; of these, M. Ger- 

 hardt has shown that alcarsine is to be regarded as an alkaloid in which 

 arsenic takes the place of nitrogen, but the parallel substance contain- 

 ing nitrogen is as yet unknown ; and hitherto we have been unable to 

 complete the analogy between these elements, by the discovery of two 



corresponding compounds, the one containing nitrogen and the other 

 arsenic. » 



The substance known as glycocoll, or gelatine-sugar, is shown bvthe 

 recent researches of Horsford and Laurent,t to have the composition 

 be ore suggested by Gerhardt and declared by Dessaio-nes from the re- 

 suits of the decomposition of hippuric acid. Its equivalent is repre- 

 sented by the formula C 4 H 5 N0 4 . The alcargene or kakodylic acid 

 of M. Bunsen is produced by the slow oxydation of kakodyle or alcar- 

 sine ; one equivalent of alcarsine and eight of oxygen, yield two of alcar- 

 gene and two of water.f C 9 H l2 As 2 2 +80= ■ 2C 4 H B AsO 4 +2H0. 



-hi i?JT ,Va i ent of / h, r ubs,ance lhen is represented by C 4 H 5 As0 4 , 

 Is for N d ° f S'y coco11 <> n| y in the substitution of 



A notice of some of the characters of the two substances will serve 

 to show their close affinity. Both glycocoll and alcargene are capable 

 ot exchanging one equivalent of their hydrogen for a metal ; and in 

 addition to this character in which they resemble acids, act the part of 

 organic bases by combining directly with acids to form definite crystal- 

 lizable compounds. Some of these corresponding combinations are 

 here represented. & 



Glycocoll, C 4 H 5 N0 4 Alcargene, C 4 H 5 As0 4 



hT m • C 4(H 4 A g )NO, Argentic * « C 4 (H 4 Ag)AA 



Hydrochloric « C 4 H 6 NO,HCl|Hydrochloric " C 4 H 5 As0 4 ,HCl 



To these characters we may add that both glycocoll and alcargene are 

 readily soluble in water, sparingly soluble in alcohol, crystallize with 



^ "" — "" i ■ i n I — n m ■I,,, mmm , ... , ■— ■ nl mi — "■ ' ' " "^ 



;; « F ° r a ,„ n , 0tice of the hi8tor y an d nature of ozone, see this Journal, «*■> 

 11 Series, 103. ' 



J This Journal, ii Series, vol. iii, pp . 267-258 and 369. „, . -. 



; fcee the corrected formula for this substance in M. Gerhardt's Precis de On» e 

 Urganique, vol. n, p. 445. 



