4t0 : Miscellanies. 
this action. Such is not a correct statement; by exposure to almos- 
pheric vapor, strong solutions of muriate of tin become weaker, and 
any masses of undissolved tin, projecting into the weaker solution, 
will decompose the denser solution below. In numerous trials, I 
have found all the cases of precipitation referable to different states 
of two solutions resting in contact. 
Roxbury Laboratory, March 16, 1840. 
22. New Minerals.—Associated with the nitrate of soda of the province of Tara 
Ihave found the iodate of soda or potash, in irregular crystalline grains. 
The ebliviodate of magnesia, in the state of eqpe colors parts of the masses of 
the nitrate of soda a lemon yellow color. This new salt, sone exists in mine- 
ral waters, conferring its highly active Shines onthem. The so called sulphate 
of alumina, from near Iquque, is a new mineral species, coipioasd essentially of 
different crystalline form, is found in the vicinity of the latter. 
1840. 
additional fact rh ee oad inferior surface of the Calymene Bufo ; 
by Poe Sc GREEN, —In one of the recent numbers of your valuable 
Journal, there were published a few ins which J had been so fortunate as to = 
lect respecting the structure of the inferior surface of the trilobite. The Caly ; 
Bufo was the species to which most of my remarks applied. ‘The following addi. 
tional note will perhaps be interesting to some of your reader 
Within a few days I received from my friend, Mr. T. A. Conrad, the zealous 
and distinguished fossilist of the New York survey, three highly interesting — 
truc 
TiPemeenee probably concave,’ &c. Now the fragments of Mr. Conra 
illustrate this part of ‘der organization in quite a satisfactory manner. ‘This space 
is concave, and the edge of the buckler beneath the eyes, which in one of the 
specimens is very perfect, is marked by six denticulations or tooth-like prominen- 
ces along the inferior edge of the lower lip. The lower lip has therefore a smoot 
or unbroken edge in front, and is terminated on each side below the eyes by 4 
dented margin. 
In no instance have I seen the interior edge of the buckler so perfect as in one 
of the oa specimens, and in looking at the groove which forms the lips, one is 
almost persuaded - believe that the mouth of the animal was really located in 
this part of the hea 
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