Miscellanies. 37 1 



Huravlite and Hetepozitc. — Du Frenov has analyzed these two 

 rals found formerly by Alluau in the Limoges. The Huraulite 

 consists of phosphoric acid 38.00, protoxide of iron 11.10, protoxide 

 of manganese 32.85, water 18. This mineral is in minute crystals of 

 the size of a pin head. The primitive form is an oblique rhombic 

 prism of 117 6 30', and 62° 30'; but it occurs in the form of rhomboi- 

 dal prisms, with or without the acute angles replaced. It shows no 

 cleavages; has a glassy fracture, and reddish-yellow color; is trans- 

 parent; scratches calcspar, but is scratched by steel. Its specific grav- 

 ity = 2.27. It fuses with great difficulty before the blowpipe, giving 

 a black bead with metallic lustre. In a tube it gives off water. It 

 occurs in the granite about Limoges. The only pieces yet found 



The Hetepozite 



f iron 34.89, prot- 



This mineral is 



M 



oo 



found only in scaly masses, cleaving, however, in three directions, 

 giving an oblique rhombic prism, having an angle of about 100° or 101°. 

 The lustre is shining and fatty, like that of the apatites. The color 

 greenish-gray or bluish* Weather-worn surfaces have a beautiful vio- 

 let color and a semi-metallic lustre. These weather-worn pieces cleave 

 with greater ease, and may be measured with the common goniometer. 

 The undecomposed scratches glass with ease, but not quartz. In 

 its decomposed state it is softer, and is scratched by steel. The spe- 

 cific gravity of the former is 3.524, of the latter 3.39. It dissolves in 

 acid with a slight residue of silica. Before the blowpipe it melts into 

 a dark -brown enamel. — Ann. de Chim. et de Phys. xli. p. 337. 



>/ 



■It results 



from the experiments of M. Serulas, 1st. that morphine alone ex- 

 erts a decomposing action on Iodic acid, from which it separates abun- 

 dantly the Iodine, a character which may be taken as a distinction be- 

 tween this base and other alcoloids : 2d. quinine, cinchonine, strvch- 

 nine, saturate Iodic acid perfectly, and produce well cr\ tallized saline 

 compounds. 



It i3 supposed by the author that these new compounds of Iodine 

 and vegetable bases, may be found to possess medical qualities of a 

 valuable character. — Idem. 



5. Reduction of Metals by Azote.— -The reduction of palladium by 

 the simple evaporation of its solution in the open air, induced N. W. 

 Fischer, as early as 1827, to suspect that the azote of the atmosphere 

 might^perate as the agent of reduction. This change takes place in 

 the solution of palladium, at common temperatures, and even when 

 the solution contains much free acid. The solution of gold, if per- 

 fectly neuter, also manifests a feeble reduction. 



