Hincks on Secret Writing. 29 



Nos. 15 and 16, I have already given that of Nos, 6 and 12. 

 I then give the translations No. 17, into the cipher used in 

 No, 18, and vice versd ; thus showing that I can not only rearf 

 but write in Mr. C.'s most secret ciphers. As to the composition 

 of these, or similar keys, I am not aware that it is very difficult, 

 when the method is so completely discovered as it has been by 

 me. This Journal, at any rate, would not be the proper place 

 for publishing the specimen of such a key. 



Sentence ciphered in Nos. 15 and 16. 

 Should this sentence also escape detection, the security of the 

 cipher will receive additional confirmation. 



Substance of No. 17, in cipher of No. 18; 

 Ijy a84naf cxkzoi rbq4i digamtuy az imktz koop yammmfa 

 8gii vcca faay^ srdxfa(ii tzxlmpj qb4yxd mkmoiicvuw Iddd 

 8rpp(iqauss<p8d ii mdfzttr(pd(i!d faaffa mmm Isaxn k]dhct> 

 wuyzkfmg. 



Substance of No. 18, in cipher of No, 17, 

 i^jlbdSrrt pxcd(i<p ijmhismmpn tmcj zx isodzmp nmmmoix 

 ndiiopp efgmtt stllxbprr x^xw4eee nfacrl oxahhaa wwoccoi 

 dlxcmadvd cdo(p8pplf hisgdv llxcfcw mmrpp facimponn axy 

 cfmld^ee jripmgxfs tt hhkmp II plllSs glgamx wxlsfeaa4m 

 gxsupiiii dfnmhgalm pw8fn tt cfcdqtt qklamk tzxt pgkx 

 pccctq. 



gh ddeaa zymijhe bdy(pl ukifyyyy oyl lt8(poj Im, 

 The last sentence contains my address in the cipher of 

 Nos. 13 and 16. 



Art. IV, Contributions toivards the Chemical Knowledge of 

 Mineral Substances. By the late Martin Henry Klaproth, 



[Continued from Page 280, of Vol. XI.] 



Analysis of the Ferro-arsenical Sulphuret of Copper, or Fahlcrz, 



from Freiberg. 



The usual difficulties of ascertaining the relative quantity of 

 arsenic where sulphur also is present, occurred in the cxami- 



