466 Scientific Intelligence. 
few more beautiful scenes than the Grand Teocalli, as seen from 
the mouth of the short valley (some three miles long, and a mile 
broad between high walls) which leads from it down to the East 
_ River: a vast pyramid, 2,700 feet high, of most regular form, in 
bare steps and courses of maroon red at the summit, and with the 
same color, blushing, as it were, with a most peculiar effect, 
through the thin grassy covering of its lawn slopes. 
Besides these grander views, illustrative of the geography and 
geology of the region, there is the usual proportion, in the usual 
variety, of minor items of scenery, such as waterfalls, lakes, na- 
tural bridges, bits of ravine, and strange rock forms, Con- 
spicuous among these last are the almost incredible shapes of 
eroded sandstone columns in Monument Park. Ww 
4, Synopsis of New Vertebrata from the Tertiary of Colorado, 
t, D. Copr. Ex- 
vey of the Territories, F. V. Hayden, U. S. Geologist in charge ; 
dated Washington, October, 1873. [Received at New Haven 
about October 15th.] 19 pp. 8vo.—These few pages, from the 
forthcoming Report of Dr. eylen are to a large extent a list of 
the species of vertebrates made out from the collections of the 
5. Precious Opal from a new Mexican loculity.—Signor D. 
Mariano Barcema, Secretary of the “Sociedad Mexicana de Ilis- 
with brilliant green points, or like a most delicate mosaic, as 
Signor Barcema expresses it, of fire-red and metallic emerald. 
opalescence, is of remarkable beauty. One variety of the precious 
oe gives violet reflections ; it another emerald with dark 
tramarine, 
