59 JOURNAL, OF THE 
Solution (9) gave crystals of carbonate containing no 
chromium and also crystals of the salt 3K,CrO,. Na,CrQ,. 
This work in the main confirms that of Zehenter though 
it introduces some new modes of formation of the double salts. 
It gave rise to some interesting questions though the time . 
was too brief to answer them. 
ORIGIN OF PALEOTROCHIS.' 
BY Ji Soopeenee. 
Prof. Ebenezer Emmons,’ while State Geologist of North 
Carolina, discovered among the so-called Taconic rocks of 
Montgomery County, in that State, a number of more or less 
regularly striated bi-conical forms to which he gave the 
names Paleotrochis major and minor, and regarded them as 
siliceous corals as well as the oldest representatives of animal 
life upon the globe. According to: Emmons, Paleotrochis 
varies in size up to two inches in diameter, and occurs with 
many almond shaped concretions, often within concretions, 
in a series of beds over 1,000 feet in thickness interstratified 
with beds of granular quartz, conglomerate and quartzite. 
1 This paper is reprinted here from the American Journal of Science 
(May, 1899, page 337) as a substitute for an article which the present 
writer had intended publishing, setting forth the same general data and 
conclusions. Mr. Diller’s work has removed all doubt as to the min- 
eral origin of Paleotrochis; and the republicztion of his paper in the 
Mitchell Journal is considered advisable owing to the intimate asso- 
ciation of the Paleotrochis with local North Carolina geology, and the 
previous publication in this journal of Mr. White’s paper (see note be- 
low) which argued in favor of the organic origin of this interesting 
form. 
2 Geological Report of the Midland Counties of North Carolina, 1856, 
page 62; also Am. Jour. Sci., II, vol. xxii, page 390, and vol. xxiv, 
page 151. 
