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vi CONTENTS. 
NUMBER CXLI. 
Arr. XXV.—On the Variability of Personal Equation in 
Transit Observations; by Wiiiiam A. RoeeErs,.------ 
XXVI.—Upon the Atomic Volumes of the Elements; by 
F WieeGLeswortu CLARKE, 
XXVII.—Contributions from the Laboratory of the Law- 
rence Scientific School, No. 7.—On some Minerals 
from Newlin Township, Chester Co., Penn., described 
by Dr. Isaac Lea; by 8S, P. Suarpizs, 
XXVIII.—On the Washing of Precipitates; by R. Bunsen, 
XXIX.—Note upon the origin of the Phosphatic Formation ; 
by C. U. Suxparp, Sr., 
XXX.—A Point in the Saree of Western Vermont; by 
the Rev. J. B. Perry, 
XXXI—On some meee of  Shlomeee 
chlorid, (CC1,)SO,Cl; by O. L ; 
XX XII.—Note on the structure of the Blastoidea; by E. 
ILLINGS, 
XX XIII—Notes on the occurrence and composition of the 
Nodular sea of South Carolina; by CHARLES 
U. SHeparp, 
XXXIV.—Notes on Anes Fossiliferous Strata; by T. 
A. Conran, 
.—On certain Phenomena of Transmitted and Dif- 
fused Light; by M. Carry Lexa, 
XXXVI.—Process for determining the Carbon chemically 
combined with Iron; by Prof. Eecrrtz, 
. XXXVII—Geographical Notices; by D. C. Gruman, -___. 
XXXVIIL—tThe Cohahuila Meteoric Irons of 1868, Mexico; 
by J. Lawrence Smita, 
XXXIX.—Atomie Ratio; by Jos1an P. Cooxs, Jr.,._____- 
XL.—Notice of some New Reptilian Remains from the 
Cretaceous of Brazil; by Prof. O. C. Marsn, _._.____- 
XLI—Notices of papers in Physiological Chemistry—No. 
; by Grorce F. Barker, _-___ 
XLU.—Meteors of November 14th, 1868; by H. A. Newron, 
297 
308 
es. 
