264 Scientific Intelligence. 
probably similar to acids derived from aloes by the action of nitric 
acid. Like these acids, erythrosin possesses high tinctorial power, and 
is recommended for its properties as a suitable dyeing material. 
© 
G. 0, 8 
19. On the Atomic Weight of Molybdenum; by N. J. Beruin, (J. f. 
pr. Chem., xlix, 444, 1850.)—From the analyses of three molybdates 
of ammonia, Berlin deduces for the atomic number of molybdic acid, 
“num by Svanberg and Struve, 575°83, based on 200 as the value of 
sulphur, must be right or very near the true one ; and not 588'966, 
based on 200-75 as the value of sulphur. Hence also 200 is the true 
» atomic number for sulphur, 
bd 
PE ora Il. MinERALOGY AND GEOLOGY. 
Ai 
“: “weit, Member of the Theological Institute of East Windsor, Ct. and 
E. Hircueock, Jr., of Amherst, Mass.—This locality, in the north part of 
* “etd 
_ 4, enormous black and blue tourmalines not perfect in figure. 
Ja mostly: albite, exhibits the spodumene in a decomposed state pearly 
att $e we - as soft ‘as m. : 
e e muc 
ive in the albite, extended into the quartz in crystals, terminated 
‘at one end, and sometimes more than a foot in len The lon 
individ h i 
a 
ts pat ees 
—— |; inches,~and som 
"usually opaque, but some are nearly translucent in parts. Good sp e 
One reason lies in the aoomgare = 
, whic 
a . 3 théecleavages, especially’ that parallel with the orthodiagona 
o % nders them-easily broken. Another lies in the nature of the gangues 
and allowing 
“pearance. ‘The crystals can be cleaned by acid with ng injury : 
+ perhaps a little damage to the lustre, The forms’of the- terminations 
ad are various. The, crystal having the. greatest ‘number of planes, has 
-been "described in’ Dana’s System of Mineralogy, 3d ed., p- 0" 
oProf. B. Silliman, Jr. Other crystals are similar 10 
swith a less One of the specimens . 
now 
