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SCIENTIFIC BOOKS. 
THE MESOZOIC FLORA OF THE UNITED STATES.* 
THE great activity in paleobotanical research 
which characterizes the work of the U.S. Geo- 
logical Survey finds renewed expression in the 
recently issued ‘Status of the Mesozoic Floras 
of the United States,’ by Professor Ward, with 
the collaboration of Professor W. M. Fontaine, 
Mr. Atreus Wanner and Dr. F. H. Knowlton. 
Without attempting a republication of results 
which have already appeared, the author aims 
to present a ‘succinct account of the progress 
thus far made in the direction of developing 
the Mesozoic Floras of the United States,’ 
enumerating for the several formations, geo- 
graphical areas and special localities the fossil 
plants that have been found, and also giving 
a complete bibliography of the work accom- 
plished, with special reference to correlation. 
Questions of expediency have necessitated a 
division of the work into two parts. The first 
of these to which our attention is now directed 
discusses the Older Mesozoic, while the second 
part will deal with the Younger Mesozoic or 
Cretaceous. 
The Triassic flora is represented by a descrip- 
tion of seventy-six species or forms, of which 
nineteen are recorded for the first time, and 
among these latter is to be noted the name of 
a new genus— Yorkia—which has been given by 
Mr. Wanner and provisionally adopted by Pro- 
fessor Ward to identify a possible grass which is 
not very clearly defined as such by the figures 
given, although the latter are very suggestive 
of a plant of Monocotyledonous type which 
serves to recall the Poacites of Saporta. 
The incompleteness of the paleobotanical 
* Ward, Lester F., Status of the Mesozoic Floras 
of the United States. The Older Mesozoic. Second 
Annual Report of the U. S. Geol. Surv., 1898-99. 
Washington, 1900. Pp. 215-430. Plates XXI.- 
CLXNXIX. 
