38 
Transactions Texas Academy of Science. 
COMSTOOK^ Theo. B. 
‘The pastural and agricultural capabilities of the major part of the 
region are hy far greater than has been generally appreciated. Much of 
the area which is now neglected or given over to grazing can he eventually 
utilized for tillage. 'In the river valleys irrigation is perfectly feasible, 
and in many places where the streams are dry at surface there is an 
abundant supply of water not far below throughout the year; windmills 
and ‘water-holes’ (tanks) now supply the needs as they exist, but a very 
much larger population and a materially increased produetiveness will 
follow the advent of the steam pump, as it has already in other similar 
oases where capital has been freely expended.” Pp. 46-47. 
“The lignite field, so far as it lies within the limits of our survey of 
1891, is confined to a comparatively narrow tract extending across the 
Pio G-rande from Mexico into Maverick county, Texas, north of Eagle 
Pass. The lignite is of excellent quality, as a rule, and in many localities 
along the northern and western edge of the field it is well exposed for 
economical mining, fit has been worked successfully in a few places near 
the surface, and it has been discovered by boring or shafting at other 
points at depths varying from twenty feet and less to three hundred feet 
and more. The Hartz Mine has the most extensive development.” Pp. 
52-53. 
34. 
Report of. 
'Thirdi Ann. Rept. of the Greol. Surv. of Texa®, 1891, pp. Iiv4v. 
Austin, 1892. 
Administrative report of the Geologist for Central Texas eovering the 
field season from May -25th to iSeptember 1st, 1891. 'Region examined. 
Personnel of the party. W ork of Mr. R. A. Thompson, topographer. Work 
of Mr. F. '8. Ellsworth, aid. Aeknowledgments. 
35. 
(Tin in Texas.) 
See Rolker, Charles M., The Prodnction of Tin in Various 
Parts of the World, 16th Annual Rept. of the IT. S. Geol. Survey, 
Pt. Ill, pp. 528-529. Washington, 1895. 
36. (Cope, Edward D.) 
Review of a paper on ‘^^The Cros's Timhers of Texas,’^ read by 
Robert T. Hill before the Washington Philosophical Society. 
American Haturalist, Vol. XXI, p. 172. Eeb., 1887. 
“The article demonstrated that these tv/o belts of anomalous timber,’ 
instead of representing quaternary or tertiary basins, are merely the 
detritus of outcrops of arenaceous strata, those of the eastern member 
being probably of the age of the Dakota sandstone, and the western of a 
sandy group at the base of the entire cretaceous series, part of which are 
of undetermined Mesozoic, and are given the name of ‘'Dinosiaur sands’ 
by Mr. Hill, while a part of them are of undoubted Carboniferous age. 
He furthermore shows that the toipography of the entire central region is 
the result of extensive denudation, whereiby the members of the geologic 
