Intelligence and Miscdlaneous Articles. 317 



iir it:fotmS'.a brigbt blvie' powder,' Wbith is petfectly unxiistmguish^ 

 able from blue iron ovQv lothe water-bath it loses a portion of 

 its water and becomes green. In its analysis, a method exactly- 

 similar to that used for vivia niteJwa8'adopte%^and)^ve;tftle'folWw- 

 iug' results :■•-*( ; i»-;. O !f. -- -.1 .'I j.'f^'iwl (/! i'ni!n(,>o>G il'in!// 

 bnri ^{lniUMi)i.) au HiU i 0H8 V.,0,4 .0/48 xii-;2ho >.U. iii oAnoAii si 



.b9.vcibl/I%lff^«t 9J^iA5u003(^li35|8;[M/..85,-28,f.l,, u3;= 25-OG .9^B7 



-nigno if(^iri¥/i .birjuboiq ^J [jsTinirn -. 2r93 24 = 22'56.i(j haa 

 ailii^faomiSbund'iilay ;be expressed by the formula i fr \\\r 



d-ml// ,ii 2(3FeO, p2 0, + 8HO) + (3Fe,, 0„ 2P, 0, + 8HO^«J 9«««^ 

 8;»i raoi't -iDr/oJoKi 9iii ; ""it ylwi,,Ki sidm aassuq 



.Qjinisiviv 'io noiii8oqmo*P^'7'Ao5/^^««'^<? </ /roHnB.noiJibnoa baJfi^oiji^w 

 oi iff: a^eutrrtl' solution of a persalt of iron, as amtnoriio^sulpftd'teof 

 f^dn, be precipitated with phosphate of soda (2NaO. HO) P;^ 0^. tHft 

 filtered solution has an acid reaction, although it contains an excess 

 of phospha,te of soda ; hence the precipitate does not correspond in 

 composition to the phosphate df soda, but- ittuat be a basic'^ikX 

 pound. It yielded on analysis,-^ '"'M' ' /;".'. '^' 



P0O3 .... 36-50 ^. \ = Z%-\0 -^^ ^^'^'^^'' 

 Fe^Os . . . ."'^ 41^6 ^^' '^°^^'l = 42-6^'^'*^ ^""^^^^^ 

 iCfig-hlQi^JS .QO^Sd) + (OH4 ^'td'^prm^ 

 A compound possessing the same composition is obtained" by 

 adding phosphate of soda by drops to a solution of protosulphate of 

 iron, until the precipitate ceases to be redissolved. The solution when 

 filtered becomes turbid by exposure to the air and deposits a yellow- 

 ish-white granular precipitate, which iw'^en Washed is identical with 

 the above salt. , mcI -ii ,■ ■ ■ 



Basic Perphosphaie of Iroi^ 1,0 a''!)?] 



, ;By the action of alkalies a portion of the acid is removed froqi 

 the perphosphate of iron, and two basic salts are formed. A. If the 

 salt be dissolved in a small quantity of muriatic acid, excess of am- 

 monia be then added and heat applied, a bright brown basic salt is 

 formed. Its formula is SFe.^ O3, 2P. 0^ -|- 16 HO, or 2(Fe., O3, Po O,, 

 + 5H0) + Fe.^ O3 6H0. B. If the perphosphate of iron formed in 

 this manner, or by precipitation, be digested for a considerable time 

 with dilute solution of potash, the whole of the phosphoric acid is 

 not removed from the oxide of iron. This substance is a very basic 

 salt of definite composition, which suffers no further decomposition 

 from an excess of alksdi. It consists of— - 



. P^OsSe.yJwoxl^SlJii .Wjhu(r 1 = 5-68 :)iq Ml moil 



Fe.2 O3* ; :'; ; ''94'29 jToijOiSD-aD.ss ^'3^<> j:; sfiri jnoii ^o 



and 18 consequently loFe^^O^. P^O,.^' gniuinoo il .QailrAla ^IIoItj 



-a-iq yriJ o^^tTDii : auii u. .u- . /■': '.anifp IlBffla B 8B Il9V/ ae ,bi3£ 



.O^'ilS \(i Jgianoo .h^t^h'^kosphate of Umtv ^iiA ar. .Jonxuso aJsiiqio 



*''Iii th^ abbVe experiments it very frequently T^appeneatlmt a liquia 



