V 
HALLS 73, 74 AND 75. 
Hall 73.— Office of the Department of Geology. 
Hall 74:. — Library of the Department of Geology. The works 
in this library treat of geology and kindred subjects, and are in- 
tended primarily for the use of officers of. the Department. On 
f l /n application to th^ urator, however, opportunity will be given to 
^tors to consult any special work. The collection of photographs 
and autographs of leading geologists and mineralogists of the 
the world, made by Mr. Geo. F. Kunz, is exhibited here. 
^ ^ Hall 75.— Laboratory of the Department of Geology. Here 
^ are ':’h mTn nippnrntirrnnd nhnmHnln-rr^d minnva, 
a- iM oreo and i - yuo^tioiib uf lulls fui lli e dihort Tll ' l lllLUli. i i^ ii' : i 
!ufnaces"a'r iLl (Jlhci kbo^atory app ’ han(» e o aro ak i o ^yhibited — 
the wn1D fifty sketches enlarged from wood cuts in De 
Re Metallica, showing methods of mining and the metal working 
appliance used in the sixteenth century. Twenty-five photographs 
of the works at Playa Blanca, Chile, show furnaces and apparatus 
used in the treatment of ores of that locality. 
l_5-/ 
(^X 
