/. ditoriul ( ornment. 4 1 G 
older a rock i- the greater is the ehance for 'i 
primitive charade 
The very nature of the bydrocarl >r a com 
elimination, though c rate, perhaps, 
these componndi from the old rej -cumulations. In re- 
gions affected by orogenic movements there would be com- 
monly a considerate ation of the pr nd with 
the P rantain-making for'- 
certainly have played an import le in has 
change. But in corn par! _ . \al presf 
upon coal beds and their associated strata in different j 
i field, i.. enter into consideration which in- 
volvi _ difficulties and require tl 
nati- 
editorial com:-: 
Thi I 8 Geological Survey. 
r Powell hfj- e d the directorship of the I • 
cal Survey of the United 3 and it is understood that the 
office will be tendered to Mr. C. Jj. Walcott,wEb has for m 
> held the position of palaeonl E - def 
g st of the survey. We trust that this ge will a . 
the reorganization of the work on tnomieal 
footing and that the - ill. under Mr. Waleott's mar. . 
ment. stand as high in tfa a of the scientific world and 
the general public as befits so important a department of the 
rnment. 
The Columbia* Exposition. 
.. d„ri other Bare Mi teraU. 
The mineralogical collections on exhibition in the various 
departments of the W - Pair de-erved. on the who. 
great deal of prai-e: but it was to b g ^d that in some 
of the sections the arrangement was very unsystematic and 
the labeling often incorrect. J. 
of each departmental exhibit. th<- i 
