94 
Transactions Texas Academy of Science. 
Bumble^ Edwin T. , 
Brown Coal as Tuel — continued. Chap. VI. Geology .of the Brown Coal 
iDeposits of Texas. Chap. VII. Occurrence and lOomposiition of Ihe Brown 
Goals of the Tertiary. Chap. VIII. Occurrence and Composition of the 
Brown Coals of the Tertiary — continued. Texas Brown Coal compared 
with European and with Bituminous Coal. Chap. X. Utilization of 
Texas Brown Coals. 
“The aggregate area [in Texas] which is underlaid by beds of fossil fuels 
is very large. In the northern central portion of the State the coals of the 
Carboniferous or Coal Measures occupy an area of several thousand square 
miles. In this area there are nine distinct seams of coal, two of which 
are of workable thickness and of good quality (^Second Ann. iRept. Geol. 
'Surv. of Texas, p. 359 et seq.) . A second, but as yet unexplored, basin 
of similar age occurs on the Rio Grande border in Presidio county. These 
are, however, somewhat distant from many localities at which are found 
ores and materials which would afford bases for great industrial devel- 
opment with proper fuel supply. 
“In the vicinity of Eagle Pass, on the Rio Grande, there is a third basin 
containing a vein of good coal in beds w.hich belong to the upper part of 
the Cretaceous formation (First Rept. of Progress, Geol. Surv. Texas; 
(First Ann. Rept. Geol. Surv. of Texas ; Notes on the Geology of the Valley 
of the Middle Rio Grande, E. T. Bumble). 
‘^By far the most extensive beds, however, are those occurring in the 
Tertiary area, which stretches entirely across the State from Red River 
to the Rio Grande (First Rept. of Progress, Geol. iSurv. Texas; First 
Ann. Rept. Geol. Surv. Texas; Second Ann. Rept. Geol. Surv. Texas; 
Utilization of Lignites, E. T. Bumble), and in which the coal beds fre- 
quently show a thickness of ten to fourteen feet in a single bank, with a 
total thickness in certain localities of from eighteen to twenty-four feet. 
These constitute, therefore, the greatest and most widespread fuel sqpply 
which lis found in the State, and the desirability of utilizing these deposits 
for manufacturing and domestic purposes has naturally suggested an 
examination into the possibility of doing so.” Pp. 17-18. 
This volume is noticed in the Amer. Naturalist, Vol. 27, p. 379. 
136. 
Volcanic Dust in Texas. 
Transactions of the 'Texas Academy of Science, Vol. I, Pt. 
1, pp. 33-34. Bead June 14, 1892. 
“Buring the field season of 1891, a number of ispecimens of a material 
nearly white in color and of light specific gravity were collected by Messrs. 
Kennedy land Walker from different localiities in the Tertiary area, over 
which they were working. From their general appearance they were sup- 
posed to be diatomaceous earth, and under the microscope several of the 
specimens proved to be composed of diatoms. Other specimens, however, 
did not show any such forms at all, but consisted of the flat transparent, 
sharply angular particles with striated or pitted surfaces peculiar to vol- 
oanic dust, and it was so deterimined by Prof. F. W. Cragin. 
“These deposits were apparently, but not certainly, all interstratified 
