Record of Geology op Texas, 1887-1896. 
141 
Hidden, William Eael. 
sonite. None iwas found embedded in the new ery&tals and masses of 
thoro-gummite. Some fifty kilognams of the broken cyrtolite were thoT- 
oughly seariehed through, with the result of finding only about two grams 
of pure material, and this name mainly from one mass, which bad a very 
thin coating of thoro-gummite.” Pp. 98-99. 
‘This paper contains a desoription of the mineral, an account of its chem- 
ical composition by Mr. IW. F. Hillebrand, and a discussion of its com- 
position. 'The author proposes “the name of mackintoshite for this new 
species in honor of that able chemist, the late Mr. James Buckton Mack- 
intosh, of New York City.” 
195. , and Hillebrand, W. F. 
Hes'cription of Rowlandite. 
Amer. Jour, of 'Science, III, Vol. XLVI, pp. 208-212. Hew 
Haven, Sept., 1893. 
I. iHistorical and iDeseriptive Discussion, by W. E. Hidden. 
“About one kilogram of the mineral described in this paper was found 
Iby the writer in rather large lumps among huge masses of gadolinite 
and yttrialite in a single shipment of the various yttria-bearing minerals 
sent to him some five years ago from the noted locality in Llano county, 
Texas. 
“The alteration products attracted my attention at once by their dis- 
similarity to those of gadolinite, yttrialite and allanite from the same 
mine. iSeveral preliminary trials proved the mineral to eontain over sixty- 
one per cent, of the ‘rare earths,’ having a joint atomic weight of 118.5. 
-If -If -:f 
“iProf. Rowland photographed the spectrum of this mineral, and also the 
‘earths’ from its oxalates and found them to be not essentially different 
from those of gadolihite and other minerals rich in yttria. He, however, 
expressed the opinion that there were at least a dozen unknown elements 
in the so-called yttria group not yet separated. The scale on which 
he showed its spectrum represented a length of ten feet, and over ten 
thousand lines were noticed.” Pp. 208-209. 
“Desoription of the mineral. 
11. Analysis and Discussion of Composition, by W. P. Hillebrand. 
196. Hill, Egbert T. 
Eeview of 
“A Partial Report on the Geology of Western Texas,^’ consist- 
ing of a General Geological Report and a Journal of Geological 
Ohservations along the Routes traveled by the Expedition between 
■ Indianola, Texas, and the Valley of Mimbres, Hew Mexico, dur- 
ing the yeans 1855 and 1856; with an Appendix giwing a Detailed 
Report on the Geology of Grayson Oounty, by Prof. Geo. G. 
Shumard, Assistant State Geologist of 'Texas. Austin, 1886. 
Amer. Jour, of Science, III, Vol. XXXIII, pp. 73-75. Hew 
Haven, Jan., 1887. 
