150 Miscellaneous Intelligence. 
to compress the spring. The glass tube has a small ring fixed in it, 
just so as to stick at avy pointto which it is pushed, and the bution at 
the top of the rod serves to push the ring straight, and the ring thus 
forms an incex of the degree to which the spring has been compressed. 
The ball on the top serves as a mere reservoir of air to equalize the 
action of the apparatus as much as possible. The whole of this appa- 
ratus is enclosed in a wire cage for the sake of protection frum blows. 
To graduate this apparatus, T let it down in a known depth of water, 
say ten fathoms, and having observed the point to which the ring in” 
the glass tube is pushed, and having marked this point off, the “ae il is 
to be unscrewed, and with a small ramrod the ring is to be pushed 
down till it resis on the top of the pision-rod. ‘The ball being scpinchde 
the apparatus is sunk in twenty fathoms; afier a similar manner it 18 
sunk in thirty, and next in forty fathoms. This will test the accuracy 
the apparatus ; and the marks made on the glass tube 3b afier each 
account of the smote use which may be ait of such an apparatus. 
- Louis Semann.—Mr. Seemann, who formerly travelled alee 
the U. Siates, has arrangements at Paris for the sale of eee 
or collections in Mineralogy, Geology, and Paleontology. To a thor- 
ough knowledge of miner als, Mr. S. unites a most excellent and obli- 
ging disposition ; 3; and “ oh gesting is one of the largest in Europe. 
His address is Louis Semann, Comptoir Mineralogique_ et Palzeontolo- 
gique, Rue St. André-des- ae No. 45, Paris. 
10. Cabinet of Minerals for sale.—-A win and excellent cabinet of 
minerals, and mineralogical works accumpanying, is for sale sh- 
ington. Address Fr. Markoe, Esq., Washington City. It is one of the 
best esi Sateen: in the country. 
11. Osituary.—James FE. Tescuemacner died suddenly near Boston 
on the 9th of last Riverabet. Mr. Teschemacher, although engrossed 
with other cares, has been an unceasing and successful laborer in Sci- 
e 
nce. He was an exact observer, and delighted in searching il 
his microscope what passed unnoticed by others. has contributed 
much to our knowled merican minerals, both through the detec- 
peci 
been laboring of late on the cine of the Fossils connected with coal, 
and the structure of the coal itself, and had collected much that was 
novel, which he was preparing for publication. 
12. Die Kreidebildungen von Texas, und irhe organischen Ein- 
schliisse; Von Dr.-F OEMER. 410. eit 1852.—This work has 
already been briefly noticed in the Se eptember number of this Journal. 
The Introduction contains, 1. A sketch of the geographical situation and 
