PROCEEDINGS 
OF THE 
AMERICAN PHILOSOPHICAL SOCHELY, 
HELD AT PHILADELPHIA, FOR PROMOTING USEFUL KNOWLEDGE. 
Vou. XVII. JANUARY TO JUNE, 1878. No. 101. 
TABLE OF CONTENTS. 
PAGE. 
Siated Meciing, January Aiviccvccw cca eacpecdepeeceessis <meod 
shied Meciing: Fanumiry AS co xake 2c caice tees es 2 ec ae ele 290 
GtEE. Meetings BeOrUmry Le i teecwa ess a0'2 Adc s aioie,0 wes ae wre 308 
SUGLECMCCLLNG, -HOD IOP YO wake tiact's sane saya aielsie sinless ies Salil 
SER IUC CETTE: DUCT CH. Ne aakritee teeth o ciaks acral qhovorerciceme ies 313 
pated. Mesting. Mareby Vita sci valiges Wotedd «Sis aka Stee ois 709 
PsthRacl MM CCLU Gs AA IINER. EW iote <te Sa echt We! He inlid Wes ote ned ahel iain vant 
Snibedy MaCONT IGS” AN PLE LD. 4. Sudan Sid aie Pes «Sh via olais wn ev alae tales 
MILLE WrasLOCUINGs = M Qamemme aa ebar stn. shel s al © i ately Soa fe Ast efevecare See 715 
plied Masiin9, Mag li. oo ek 8 oe Sask PISO CE RIOR ne 720 
SELLE OCEUING A IL ILG Cilox atw a nie aikieherwrebiresciei ore toreis 29 eye leser ears 726 
Results of Wave Interferences. By Pliny H. Chase.... ........+.- 294 
On the Cordaites and their Related Generic Divisions in the Carbon- 
iferous Formation of the United States. By L. Lesquerewr........ 315 
On Columella and Stapes in Some North American Turtles. By 
era emma rein L WOOD IRLES, Yeas soars ee pian a iemere ey o.she.ge we © 335 
Notice of the Discovery of the Position of the Crural Processes in the 
Genus Atrypa. By Wm. Ginley [With Plate.]..........0...ceee 357 
On the Afrolitic Epoch of November 12th-13th. By Daniel Kirk- 
LE hoa Rees Ben oO oun ANG ~ he PORTE TC OIE EE ie eek ra irae 539 
Criteria of the Nebular Hypothesis. By P. H. Chasé........:..+6. 341 
Section of Devonian Rocks Made in the Catskill Mountain at Palen- 
ville, Kauterskill Creek, N. Y. By Andrew Sherwood, for Prof. 
eH PME No HH scot ave ee Seger ais 5 Siar Ree oh Oe oe a Sh nm a 346 
Section along Schoharie Creek in Schoharie County, N. Y., between 
Gilboa and Middleburg, from the Catskill down to the Upper Hel- 
derberg. By Andrew and Clurk Sherwood.......... eS 347 
' (Continued on 4th page of Cover.) 
