teMdr oe, S © Oe) 6 ee Wr eG a Na! bye) ©, 
PROCEEDINGS 
OF THE 
_ AMERICAN PHILOSOPHICAL SOCIETY 
HELD AT PHILADELPHIA 
FOR PROMOTING USEFUL KNOWLEDGE 
% > Vor. XLIT. - JANUARY-APRIL, 1903. No. 172. 
Bet ' CONTENTS 
ae . PAGE 
4 Stated Meeting January 2......... 0... eee cece ee ees eies fas ee 3 
+ s REE COLUAG 5 SUMUAP IEA anu ons «cin opine ws Coe nO os sl alvre eee cae 4 
ee “Stated Meeting, February 6... 6... 0... e ccc ececccccuccsectecuceles 4 
oer — Stated Meeting, PADEUEONY CO se oo. «+ cides hi Roms oa oe cele Utes or oe 5 
z es . Stated Meeting, March 6............... Peete ee i 5 
é peered Meeting, Mare 20.3. eco. eee Pee dal es a ceed wane 6 
ee General Meeting, April 2, 3 and 4... .. 66. 0cc cc cece ce ec ede vceteeeens 6. 
2 On a new Genus of Hydroid Jelly-Fishes (with plate). By WILLIAM 
oe, ICR Hess ROOKET ete Like Get is). woes swe ebisa cee nana te, apo 11 
The Problem of the Trusts. By:C: Stuart PATTERSON =. .!.....45- 15 
The Inclusion and Occlusion of Solvent in Crystals. An Insidious 
iz = Source of Error in Quantitative Chemical Investigation. By 
ERS PHEODORE, WILLIAM RICHARDS... 2.0.2... 0.2 2c cece ee seeaeus 28 
A’ Résumé of the Composition and Occurrence of Petroleum. By 
; Deepening eM TNIG Ts So saci oe, ce a aie c id a Re aids pele a He LEE 36 
oe. ‘The Forward Movement in Plant- -breeding. By L. H. BarLey...... 54 
“The Curtis Steam Turbine. By W. L. R. EMMErT Peet Saar eae Aric =! 68 
sb: iad ‘Applications of MacLaurin’s Series in the Solution of Equations — 
fe -and in the Expansion of Functions. By P. A. LAMBERT..... 85 
; ae the. Properties of the Field surrounding a Crookes Tube (with 
; Plates). By ARTHUR W. GOODSPEED. .2.......-cececeeseeees 96 
PHILADELPHIA : 
THE AMERICAN PHILOSOPHICAL SOCIETY, 
104 South Fifth Street. 
1902. 
