386 Miscellanies. 



occurred." Why were the wires changed, unless with the impression 

 that a particular something, connected with the nature of the wire, 

 might be concerned in producing the effect ? I cannot pass over the 

 letter from which I take that extract, without remarking on the great 

 want of courtesy on Mr. Sturgeon's part in sending you an account of 

 experiments made for the Electrical Society, the date of his communi- 

 cation being a week antecedent to the day when they were read before 

 the Society. 



In conclusion, I would advert to a slight error into which Mr. Stur- 

 geon must have fallen in his over-anxiety to be correct. : he tells you 

 the zinc was amalgamated ; lest your readers should, in preparing a 

 battery of this kind, be led to incur the trouble and expense of this, I 

 would remind them that the zinc was in the condition in which we re- 

 ceived it from the workmen. 



With every apology for trespassing so much on your time and valu- 

 ed pages, believe me, gentlemen, your obedient servant, 



Charles V. Walker. 



2. Miner alogical Notices, hy Br. Lewis Feuchtioanger. — The in- 

 defatigable mineralogist, Breithaupt, has, according to Berzelius's an- 

 nual report for 1839, discovered eight new minerals : viz. 



1. Trombolite, (^d-gofi^Sog, numb, stiff,) a phosphate of copper resembling 

 an opal from Retzbanja, Hungary, of a sp. gr. = 3.38 to 3.4 ; is of 

 green color, opaque, and conchoidal, vitreous fracture ; according to 



Plattner's analysis, it appears to have the formula Cu^P+16H. 



2. Allomorphite, a sulphate of barytes, containing 2 per cent, of sul- 

 phate of lime, of papillary form, and found in an ochre mine near 

 Unterwirbach, Duchy of Schwarzburg. 



3. Anauxite, [avav^tjg^ not growing larger,) from the highlands of 

 Bilin, of volcanic formation, resembles in appearance the Pyrophyllite, 

 but on heating does not swell but peels off; is translucent on the edges, 

 dark greenish white, fine granular, foliated fracture, sp. gr. 2.264 to 

 2.267. Contains silica 55.7, and water 11.5; the balance is alumina, 

 calcia, and protoxide of iron. 



4. Polyhydrite, a silicate of oxide of iron from Breitenbrun, Saxony, 

 is of a hepatic color, vitreous lustre and opaque, sp. gr. 2.1 to 2.142 ; 

 contains 29.2 per cent, of water. 



5. Serbian or Miloschin, forms a protruding layer in a mountain in 

 Servia. Serbian is blue or bluish green, acquires a lustre on rubbing, 

 opaque, conchoidal fracture, and sp. gr. 2.131 ; it crumbles by water 

 with a noise ; it contains principally alumina, less silica, oxide of 

 chrome, a trace of magnesia, and 22.8 watef. 



