pseudomorphs of Iolite, arising from a change of composition in crys- 
tals of this species. The change approximates the material to the 
‘mica or steatite family, altering the crystallization and rendering the 
structure foliated or micaceous, parallel to. the base of the prisms, 
83. Geld at Dedham, Mass.; by J. H. Buaxx, (communicated for — 
this Journal.)—Recently, upon exposing to view a small portion of a 
vein of quartz-in granite in the town of Dedham, IJ discovered numer- 
ous small particles of gold, some of them weighing from two tenths to 
eight tenths of a grain. The average width of this vein is about four 
inches; its course is E. 10° N. by W. 10° S., and its dip is to the 
' Southward at an angle of 76°. 
' Occurring in the same vein there is found also sulphuret, black oxide 
and carbonate of copper, together with galena containing silver. An- 
other vein affording galena, about five feet south of this vein, and hay- 
ing a like direction and inclination, has been exposed. 
- Gold washings of the Rhine; by M. Davzriée, (L’Institut, No, 
654, July 15, 1846.)—Some centuries past, the gold washings of the 
Rhine were quite flourishing : but since the discovery of America, they 
have lost their importance, till now there are but few persons employed 
upon the banks of this river, and only about 45,000 francs of gold are 
annually extracted between Basle and Manheim. Explorations have 
een made above Constance; but the most productive region is within 
the limits just stated; and here both banks are equally productive. 
The working is considered as paying when a workman. can collect 
One and a half francs per day. The sands of the first quality have s 
_ Tichness represented by 0000000562; those of the second quality, by 
0:000000163 ; the sterile sands, taken promiscuously furnished scarcely 
0:000000008. The sands of Siberia are five times more rich, and 
those of Chili ten times more so, than the best of the Rhine. The 
auriferous land of the river is calculated to contain 52,000 kilogrammes 
of gold, having a value of 165,828,000 francs ; but it is mostly cover- 
ed by soil under culture. : ; .. 
. 35. Observations upon some Sandstone Rocks in Baldwin Co. Ale. 5 
by Artemas Bicetow.—I perceive by Mr. Lyell’s letter in the March 
number of this Journal, that he has recently been in Alabama ‘ but he 
Makes no mention of a sandstone formation, which is quite extensive in 
the southern part of that state. Mr. Buckley, in one of the former num- 
bers of the Journal, mentions it-as being near the wocks 28 “nen ci 
Zeuglodon is found, and as containing tubes of sandstone. It is also 
exposed near Pensacola. In Baldwin Co. it is exposed frequently 
“through an extent of several miles along the sloping ground which de- 
Scends to the Tensaw River; which river divides from the Mobile on 
Mls tndeoses agein at the Bay. { have found the sandstone, also 
_ 0 the level land more than six miles from the river. 
