264 Scientific Intelligence. 
dhnlichen Leuchtstoffe, in i auf thre Feuergefihrlichkeit und thre An- 
wendung. Magdeburg 
Also the sonpitiogst wienare of ScuraveEr, F. W. Ueber die industrielle 
und national-dkonomische Bedeutsamkeit der Gewinnung von Chemikalien eco 
sondere des Paraflin’s und Photogen’s aus dem Kohlentheer, u. s. w. Asch 
gst ae 1856. 
quotations. The first from Dr. Antis ells book, cf 15. “An impression has 
taken hold of the American Keciepiaan f public ¢ hat oe patent of Der 
a 
rong be this country, an ill-fecling has been produced against it. at 
the ow of this patent have not acted wisely by witholding sales and 
liskiees. wider it until very lately, is to be regretted; but that it was a 
fide improvement in an art at the time when it w as patented and that therefore 
the patent ier alitly issued in re country, pits Mag. o shadow of 
n 
land L disciesing this mode oy obtaining sala raffine oil which were 
, were aera that the patent would be pune rel although Mr. Young 
never P al those books, and al ough that mode had not been actually put 
in practice. If on woe books in England in aire sonees accessible to all 
o were interested in the subject, which disclosed this, and wou uld instruct 
them and enable them to obtain the paraffine and the vatiine oil from the dis- 
tillation of bituminous substances, then Mr Young’s patent would be invalid.” 
Frank H. 
See ee 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PHYSICS. 
1. On a probable means of rendering visible the Se buen: in the Hye ; 
by Oapen N. Roop, Prof. of Chemistry in Troy University.—Some time 
ago while looking at a bright sky through three Saises of cobalt-glass, I 
saw with astonishment that the “i of view was ss ed with, and travers- 
ed in all directions by small bodies resemblin aleu 
y were seen on the blue field 2 as yellowish spots, and always appear: 
ed elongated in the direction of their motion, which was as a general thing 
silsabhy se a orm. The same result was obtained by experimenting upo? 
the eyes of an mber of persons. 
Convex Sie of various foci, (from 3 in. to $i in.), were now held be- 
fore the eyes, so as to give the blue light various degrees of conver” 
gence and divergence, without in the least altering the appearance of 
the moving bodies; this seemed to indicate that their locality was in 
the retina or in its immediate neighborhoo 
ition near the axis of vision was selected, and satu when it 
was found ane ager in traversing this spot always p rsued the 
rection and path, disappearin r positions ' 
near the axis gave ke senate. oi is Saeeacieat at os 
* Loc. cit., p. 520. : 
ol es 
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