Vili CONTENTS. 
NUMBER CLXXIV. 
Pag 
Art. LIV.—Notes on American Earthquakes, No. 14; me ge 
i it OCR WOGK, Olio Goce ee sos bt 
LV.—Taconie Rocks and aetonh by Jamexs D. ee 437 
VI.—Notes on the possible age of some of the Mesozoic 
es of the Queen itotes Islands and British Colum- 
bia Ae J. iSpioetapetden Whore wee si WON Oc ond be 444 
LVI, See of eet Maas.; by A. G. Dana, ons. 25: 455 
LIX.—The Genealogy and the Age “a a Species in the 
Southern Old-tertiary; by O. Muyer,...........-.--- 457 
LX. eae tay Iron from Trinity ae California; by C. 
. SHE pili ee - 469 
LXI.—The ae sdam Group east of San ee Ridge at Baloon : ore 
Falls, Virginia; by H. D. Campsent, --.-....------- 470 
LXIL—Geology of the Sea-bottom in se approaches to New 
York Bay; by A. Linpenkonn. (Plate IV),.--..--- 475 
LXIIL. oe of the Wood’s Holl Region, Mass.; by 
B. F. Koo 4 
LXIV.—Cause of the ok booed aa come in Ameri- 
can Sphene (Titanite); by G. H. Wiittams,__-..------ 486 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics—Report on the results of an ee as to the chem 
ical methods in use for the determination of organic matter in potable Waser, 
: Radiati i 
Measurement of low temperatures, igh raion New property of Sele- 
nium, W. Siemens: On the depth in the sea to which light penetrates, H. 
Lot and Ep. Sarasin: Thermo-electric vsti, CLAMOND and CARPENTER, 
495. 
Geology #Y anne logy. Pg Sr eg Geological Congress: Pennsylvania Geo- 
eee s of Counties: apr Safflorite, L. W. McCay: The Santa Catha- 
aM on e, O, A. DER 
gepieane e: ges hishifnie —Coneours National de Compensation de Chro- 
temperatures, G. CELLERIER, 497,—Annals of the Astronomi- 
pee P Obaeceuiere of Harvard College, E. C, PickerinG: Thunder Storms: Van 
Bemmelen, 498. 
INDEX TO VoLUME XXIX, 499. 
