Miscellanies . 371 



3. HuravUte and Hetepozite.—Bn Frenoy has analyzed these two 

 minerals 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° 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 tiibe it gives oft" water. It 

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

 were picked up by Mons. Alluau, near Strassenban. The Hetepozite 

 is composed of phosphoric acid 41.77, protoxide of iron 34.89, prot- 

 oxide of manganese 17.57, Avater 4.40, silica 0.22. This mineral is 

 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 sci'atches 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. 



4. Combinations of Iodic Acid with Vegetable Alkalies. — 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, strych- 

 nine, saturate Iodic acid perfectly, and produce well crystallized saline 

 compounds. 



It is 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 operate 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. 



