Translations and abstracts from the French. 263 
A eeletow 83 — o ee with excess of acid, is then 
poured in so as ne o fill the tube. When. this tps is 
placed ina plane, a rer with that of the magnetic meri-, 
dian, the precipitation of the silver and the pcneen of the 
arbor diane, is abundantly more rapid than when the tube 
is placed at right angles to the meridian, and it is more rapid 
in the north branch than in the south, and the crystals at the 
same time are more brilliant and more perfectly needleform. 
After the crystallization had become very manifest in the 
north and south tube, and while little or no change had ap- 
peared in that placed east and west, two artificial magnets 
were placed opposite to the mercury in the latter tube, one 
with its north pole adjacent and the other with * oe pole. 
The sive then began to appear in the usual ma 
ive the silver greater freedom to extend itself during 
pronipaation, in a certain direction, small squares of glass 
were procured, on which were described circles with tallow ; 
within these a solution of silver was poured, and in the center 
was placed a round piece of zinc. The silver pean 2! 
began to form in circular zones ; but in such a manner that 
the circles extended much more towards the sensi ei to- 
wards the other point of the globe. The zinc and its oxide 
was in this case observed to incline towards the south. 
lass plates were afterwards placed at twe inches 
4. Galvanic protection by the contact © heterogeneous 
tals—A communication of A. Mee Beck, of Utrecht, in 
oa influence. 
. I placed in a vase filled with sea water, a plate of cop- 
ee the metal was promptly oxidized, and the water acquir- 
ed i = a ara time a deep ae color. 
. A plate of copper, Pp ced under the same circumstan- 
col “butt . which I had ated a small plate of iron, tin or 
