Miscellaneous Intelligence. 441 
6. Notes on California; by W. P. Braxe, (from a letter to one of 
the Editors.)—I found a greater number of intruded igneous rocks in the 
Gold region than I anticipated. ey vary in character and are proba- 
bly of aimetent a The prevailing trend is N. to N. 45° W., and when 
either traverse their. mass or Constitute a wall between them and the 
adjoining slates. Quartz veins traversing the slates conformably and 
anes: without any apparent connection with the igneous intrusions 
are = ommon, 
Som of he auriferous quartz veins are worked with great profit. 
Of thin, I am satisfied from careful examination, and I have many inter- 
esting details on this subject. 
he elevated placer snes are very extensive, and are worked 
with st skill and succe 
umerous explori on em sunk in all parts of the country on 
the i of the hills, have developed many interesting facts concerning 
ret eat drift. There is in most places where placer mae is being 
conducted above the aay rivers, a thickness of two hundred feet or 
a of stratified materials that appear to have been laid fe compara- 
tively quiet water. The peculiarities of these deposits are so various 
and they are so different from those generally known as drift, that a 
wide field is opened for investigation and many detailed observations 
will be required, before we can understand the changes that have taken 
place in this part of the continent during and since the “ drift period.” 
Since I wrote you about the gold and platinum from Port Orford, I have 
examined several other samples and find that the percentage of platinum 
is ee: and that iridosmine is generally in large proportion. 1 have 
no ral ounces of the mixed metals separated from the gold. The 
neg are ney: hard but are probably too small to be used in the manu- 
facture of pen 
‘fs Tsimigeane y.—A new method of copying pages of a printed 
work by transfer, invented by M. Edward Boyer in France, is thus 
named. It is claimed that any book or engraving may be thus copied 
a little expense, and copies multiplied indefinitely, so that a book, 
wever rare, never need be out of print. It is done rapidly, without 
feskac the Breve; and so exactly that the most practised eye cannot 
tell the differe 
tells us, the immense importance of such a theory, and was pelghied 
with the new light which immediately struck his mind. He e down 
at the time the opinions which were offered, and three years fame, when 
Seconp Serres, Vol. XVIII, No. 54.—Nov., 1854. 56 
