ERRATA. 
The reader is requested to correct the following errata in Vol. XXX. of the 
American Journal of Science. The writer of that article, at the time of its pub- _ 
lication was in the Indian country, on Red river, several hundred miles west of 
the Mississippi, where the proof sheets could not be sent to him; and it is only 
since his return from that part of the country, that he has seen the article in print. 
There are several errors in punctuation, but the verbal errors only will be noticed, 
W. We. 
Matuer, Mining Engineer. 
P. 326, 1. 3 fr. bot. for quality, read equality —P. 328, 1.9 fr. a for EET 
read expansible ; 1.11 fr. top, for will thrust, read will be thrust.—P. 329, 1 
top, for those, read that 
xxx11.—P. 272, 1.5 fr. top, for 9, read 266.—P. 290, 1. 17 fr. top, for oppo- 
site, read preceding 
CORRECTION. 
_In Prof. Green’s notice of Trilobites, in this No. p. 169, for Asaphus Platypleu- 
rus, read Trimerus Platyplewrus, this correction being made in consequence of 
the examination of ee ee 
Py ence 
