1862.] 303 



has been lately imported into England in notable quantities. 7. A 

 modern limestone rock, forming on the coast of Flanders. 8. The 

 Limon de la Hesboye, a loam which covers a large portion of Belgium 

 and part of France, and which is extremely remarkable for its 

 fertility : although it contains upwards of 90 per cent, of sand, its 

 analysis shows that it possesses all the chemical ingredients necessary 

 to form a fertile soil. 9. Vitriolite, or natural sulphate of iron, 

 recently discovered in Turkey, and which has been analysed by 

 M. Pisani and the author ; it is remarkable from the fact that part of 

 the iron is replaced by copper, without changing the crystalline form 

 or the percentage of water. 10. An oolitic hematite from Namur 

 (Belgium), remarkable for its peculiar structure, which may have been 

 caused by the incrustation of insects' eggs (Notonecta), as we see is 

 the case with the oolitic limestone of the Mexican lakes. 1 1 . The 

 argentiferous quartz or gossan of Cornwall, in which the author finds 

 that the silver is contained as Fahlerz (grey copper) : when the grey 

 copper is freely disseminated through the rock, the percentage of 

 silver (metallic) averages about 0'2 per cent.; but in the ordinary 

 yellow and brown gossan, where the grey copper is not visible, the 

 silver averages about 0*04 per cent., or 14^ oz. to the ton. 12. The 

 iserine sands of Australia and Bourbon Isle. 13. A bituminous 

 conglomerate from Australia, remarkable as containing nearly 40 per 

 cent, of petroleum and bitumen, with carbonate of lime, sand, and 

 mica, &c. ; it exudes from a tertiary limestone on the river Murray. 

 14. The arseniferous sulphur of Naples, which, according to the 

 author's analysis, contains, besides 11 '162 per cent, of arsenic, about 

 0'264 of selenium, which can be easily extracted from it in a pure 

 state. 



Of each of these substances the author gives in the present paper 

 a detailed description and a complete analysis, believing that such 

 researches are not devoid of utility. As most of the substances 

 alluded to are applicable in some way or other to the wants of man, 

 the author is continuing these investigations as opportunity offers, 

 by submitting to careful analysis the different new or little-known 

 minerals which happen to come under his notice. 



VOL. XII. 



