Comlinations of Sulphur and Phosphorus with Tlatina. 27 



Reference to Plate II. Fig. 1, the Section of Mr. Jones's 

 Temporary Cam Rick. 



The letters describing the same pans of the construction 

 of the rick, agree with those in Plate I. 



AB, being'the two upright outside hurdles. 



CD, tlie two inclined hurdles. 



EE, the poles or slicks on which the sheaves are to be 

 first placed on commencing the rick, and which cross the . 

 hurdles 



HKHH, the sheaves composing the body of the stack. 



n, the conical rouf, the lower" part of which projects 

 sufficiently over the body of the rick, to cover it from wet ; 

 and in this roof, each round of sheaves are to be placed so 

 as to cover the ears of the sheaves below, and gradually 

 rise to nearly a point, over which a bundle, containing two 

 or three sheaves, with the butt ends upwards, and tied to- 

 gether, cover the centre or uppermost point of the rick. 



Vil. On the Comlinations of Sjilphur and Phosphorus ivilh 

 Platina*. By Edmund Daw, Esq. Chemical Operator 

 and Siiperir.tendant oj the Mineralogical Collection in the 

 Royal Institution. Communicated by the Author. 



]. Introduction. 



Platina, since its first introduction into Europe, has en- 

 gaged the attention of the most enlightened chemists. The 

 early experiments of Lewis, Marggraft", Bergman, &c. made 

 us acquainted with many of its properties. In their at- 

 tempts however to combine it with sulphur, they were un- 

 successful ; nor has this combination been hitherto found 

 in nature, or been produced by any artificial processes. 

 The crude ore of platina has been ably investigated ; but the 

 combinations of this metal with inflammable bodies, with 

 cxygene, and with acids, have not yet been examined with 

 precision. An accurate investigation of these compounds 

 is wanting to complete the chemical history of platina, 

 which, when supplied, can scarcely fail of useful applica- 

 tions to the arts and manufactures. 



2. Of the Comlinations of Platina with Sulphur. 

 The early attempts to combine sulphur with platina, _ 



• These compounds were made in the autumn of last year ; but owinp to 

 circumstances which it is unnecessary here to mention, their jiublication 

 has been delayed. 



were 



