76 REPORT— 1871. 



The parallelism of Clienevixite (Cuj As^O.+Fe^Hc OJ witli a portion of the 

 above formula is worthy of attention, and may justify the formula being written as 



2{Fe,P,0, + Fe,H,0,} + Cu3P,0,+Fe,H3 0,+Fe3P,0,. 



A larger supply of the mineral will no doubt soon be forthcoming, when the 

 formula may be fixed on the foiindation of more certain analyses. The specific 

 gravity of this mineral is 3'47o, that of Dufrenite being (from Siegen) 3-2 to 3-4. 



The chalkosiderite of Ullmann, the name by which, nearly sixty years ago, he 

 designated a tliin crystalline coating overlying the radiated variety of the 

 Griineisenstein (Dufrenite) of the Hollerter Zug, Sayn, "Westphalia, does not 

 seem to have been analyzed by him. He states that it contains copper ; but the 

 subsequent analyses of Griineisenstein do not appear to confirm this statement ; 

 indeed it appears more nearly to resemble the green crystallized mineral which 

 has iu this note been provisionally described as Dufrenite. 



On Ozonometnj. By T. Moffat, M.D., F.G.S. 



The author stated that ozone test-papers did not become permanently colom'ed in 

 the neighbourhood of cesspools, and that the brown colour, when formed, is 

 removed by the products of putrefaction. He also stated that light, the humidity 

 of the atmosphere, and direction of the wind influence the colouring of the test- 

 paper. Moisture with heat accelerates the chemical action, while a strong wind 

 causes a greater amount of ozone to impinge upon the test-paper in a given time. 

 To counteract the effect of these, he recommends that the test-paper be placed as 

 far as possible from cesspools, and that it be kept in a box. He next described a 

 tube-ozonometer which he had in use, and gave results obtained by an aspirator 

 ozonometer, and concluded by stating that the results obtained by the latter instru- 

 ment were not satisfactory. 



On the Photograj^luc Post. By the AsBfi 3Ioigno. 



On an Antimony-ore from New Zealand, By Paitison Muik. 



Note on Eerjiccnic Acid. By Dr. T. L. PuirsoN, F. C'.S. 



Rogianic acid is one of several new substances which I have obtained at various 

 times during the last few years from the fruit of Jut/Ians rcgia and another species 

 of wahiut. The green husk of the walnut cedes to benzol a yellowish substance, 

 which crystallizes, apparently in very elongated octahedra or feather-like gi'oups 

 of prisms. This substance, which I term ref/ianine, is easily decomposed, and 

 Avheu treated with alkalies or ammonia, yields splendid red-purple solutions, 

 whence acids precipitate a brown flocculent substance (impure regianic acid). The 

 latter, redissolved in a wealc solution of soda, precipitated again with hydro- 

 chloric acid, and washed with boiling water, forms a jet-black amoi-phous powder of 

 great density, which is pure regianic acid. It yields to analysis the composition 



0"= H» 0^, 



and forms a brown lead-salt, PbO, C^ H" 0^, also a jet-black silver-salt, very simi- 

 lar in appearance to the acid itself, and vAi\\ lime a beautiful pink-coloured salt, 

 which is precipitated by boiling its solutions with a little ammonia. 



Regianic acid is insoluble in water, but dissolves in alkalies with a beautiful red- 

 purple tint, that has no particular action upon the spectrum. It appears to be 

 derived from regianine by oxidation, for I extracted all the oxygen from a volume 

 of air by placing iu it a little regianine and soda. 



Note on the Action of Aldehyde on the two Primary Ureas. 

 By Dr. J. Emersox Eevnolds. 

 The action of the dicarbon aldehyde of the fattj- series, C^H^O, on certain den- 



