62 The American Geologist jan. i89o 
CORRESPONDENCE. 
Letter FROM M. A. Michel Levy. Monsieur: Je viens de recevoir 
votre aimable envoi, et je m' empresse de vous en remercier cordial- 
ement. 
Je voiia suis reconnaissant d'avoir fait connaitre au grand public qui 
s' interresse, en Amerique, aux choses scientiflques, que la science 
allemande n' existe pas seule, en mati&re de travaux petrographiques. 
J'appelle de mes voeux le moment 6u le langage petrographique 
pourra etre unifie, grace a des concessions reciproques, et en cherchant 
un appui sur des faits contingents, independants de toute hypoth^se. 
A ce point de vue, je pense que vous avez rendu service a la science en 
faissant connaitre mes objections 'd la classification par trop th^orique, 
adopte par Rosenbusch, et suivie actuellement par les nombreux 
adeptes de la puissante ecole. 
Croyez, cher monsieur Jl mes sentiments reconnaissants et devoues. 
Paris le J6 Novembre, 1S89. A. Michel Levy, 
Monsieur Alexander Winchell. 26 rue Spontini a Paris. 
The fossils of the Trinity beds. Pardon me ^or entering a mild 
protest against the revision of the species from the Trinity beds of 
Arkansas, published in your last issue from the pen of my esteemed 
friend Mr. Jules Marcou. The Pleurocera is neither a Nerinea nor a 
Cerithium, nor have any of the numerous specimens shown "the 
opening with a fold so common to the Nerinea," but upon careful 
examination of many specimens no such folds are apparent. What Mr. 
Marcou mistakes for a fold is a fragment of stone. Neither is the 
Vivipara a Natica as shown in the excellent illustrations. I fear that 
Mr. Marcou has been a little hasty, as he will no doubt confess, if he 
examines the specimens. The fauna is estuarine and brackish, 
accompanied by sharp sands, lignites, clays, cross-bedding, verte- 
brates, etc. 
Very respectfully, 
Austin, Dec. 5, 1S89. Robt. T. Hill. 
PERSONAL AND SCIENTIFIC NEWS. 
Pr0f. C. L. Herrick, Granville, 0. has been Appointed 
professor of biology and geology in the University of Cincin- 
nati, at Cincinnati, Ohio. 
Prof. E. D. Cope has been Elected by the Trustees of the 
University of Pennsylvania to fill the chair of geology in the 
auxiliary course of medicine in that institution. 
The Deepest Bore in the World, claimed at different 
times for a number of places is, according to the latest 
accounts, at Schladebach, a small German village near Leipsic. 
It measures 17,484 metres, or about 5,735 feet. The time ex- 
