Mineralogy and Geology. 119 
y C. A. Wurre. 
From a letter to one of the editors, dated Nebraska City, June 6th, 1867, 
—While at Red Oak J unction, the county seat of Montgomery county, 
ausiactory, since it confirms my previously expressed opinion; the place 
18 the most southerly point at which undoubted Cretaceous rocks have 
seen in Iowa, 
8. C. A. White on Drift Phenomena in S.W. Iowa.—To the close of 
the first paragraph on page 308, vol. xliii, the following sentence should 
be added. “Sets No. 3 fon an accompanying map not published] repre- 
: ith the general direction of 
the drainage upon the western water-shed, and sets No. 1 and No. 2 rep- 
seent currents approximately coinciding with the general courses of the 
Missouri and Platte rivers.” 
9. On new localities of Diamonds in California.—Prof. Silliman com- 
quuicated through Mr. Goodyear the following facts to the Academy 
Sciences of California at the meeting on May 7th. One diamond had 
the deep gravel wasbings, 
~ Second specimen was from Forest Hill, El Dorado (Placer ?) county ; 
Weight 5°673 grains, equal to nearly 14 carats; color good, but less 
and symmetrical than the first. The third specimen was from Fiddletown, 
hone weighing much 
ba underlying a stratum of lava or compact volcanic ashes. T 
rth specimen was from Cherokee Flat, Butte county, which has ac- 
“pn some reputation as a diamond locality. It has been cut and set 
Bin: ete upon * Pamtzite;” by Wat. P. Buaxe.—The silver ore from 
aunt Springs, Mono county, California, described by Mr. Arents as a 
»-” Mineral under the name Partzite (this Jour., xliii, 362), appears to 
be @ mechanical mixture without a definite chemical composition. It 
vidently results from the decomposition of the antimonial and plumbifer- 
