120 CC. A. White—Floral Types in the Laramie Group. 
which few geologists van afford to bestow upon it; and as with 
special investigations generally, so in this case, the men who 
have not made such study are prone to ignore or disparage both 
the investigation and its results. It assuredly speaks strongly 
for the respectability, and equally makes for the probability of 
the theory, that nearly every geologist whose writings show that 
he thoroughly comprehends it is disposed to regard it as some- 
thing more than a vague hypothesis, and that those wlio un- 
derstand its principles best are most ready to teach it as a 
tentative but probable geologic and cosmogonic doctrine. 
Never more, and seldom as much, may be said of the narrower 
speculations of empirical geology. 
Salt Lake City, Utah, April 15th, 1883. 
ArT. XV.—On the Commingling of ancient Faunal and modern 
Floral Types in the Laramie Group ; by CHARLES A. WHITE. 
' [Published in advance by permission of the Director of the U. S. Geological 
Survey.] 
ee of Dakota, to which Dr. Hayden gave the name of Fort 
them has, qu 
Dr. Hayden at the same time and from the same localities, col- 
