CONTENTS. 
PAGE 
Proceedings: November 200 so... rece cre renee ca wale m sicia mea spn 65 
Vaccination introduced in New: Yorks....- =. case... > sce tees 65 
Marbles\(title)BysJaio. NEWBERR Yes emeeeninie te eee eee eens 66 
Notes on Lantern-fly.. By J. C. BRANNER..........005 seecvess 66 
Proceedings November 28. sis deere eee ees eele eens ors efotere 68 
Notes of recent Travel in Europe. By H. C. BOLTON .......... 68 
Proceedings: December 5....... P58 AOS O EMO Or EE rc aoOS S500 F< 71 
Velocity of Gravity (title)... By H. A. MoTT.............-02c.0 reattl 
Proceedings: December 1oi oss nrtn. Se Bkcewin etelttaye cx ayes ye ete ele eee 72 
Apparatus for demonstrating Refraction, etc. By W. LECONTE 
RS TEAVIENG | (5,52 tosoreicistajole ater oie iere re ph etait fesatsialelovcue a atencane veto (ete cae cietaane 72 
Mechanism of Flight. By W. P. TROWBRIDGE.... ........0.0: 75 
Discussion Of papernscc . selecsiidda oesiten = yeiisttaelae ete ee eee aire 
Proceedings: "December 19)... eieee «eileleie sie eccrine ieisiatel siete eet 78 
Memorial of J“CARSON BREVOORT. (02. 'sileasiey ce eleroiie= ete mieiotere 78 
Discussion on Mechanics of Bird-flight....:.-..<. 22... 025.200. 80 
Soarmevof Birds. Byrd. Bb saOLDERm dele seer eer ieetetiarcileeteleire 83 
PFOCCeCINEs: <oaUUMAT Ve a sis7. oo tarea bet A, oe nidne Siete isle © winteleita © Mints pubes 88 
Proposedi@han ges in siy alas eva pee era eee te telelelcietelei os oletaieeieeeisieos 88 
Amc hoc ame bl aiibits ct ei corsiere feist iets sel ite uct tvettteh rele oy -.ole's eters (oncieteretchets 89 
Structure of Birds in relation to Flight, etc. By J. A. ALLEN... 89 
Discussion of ‘paper.cyn 55. 5: sieouwinic) ow eee ee ~ 0 oo cle aie ae eer 99 
le woeey-obnveass Amir. Miso on aclaneocded oodontdeooddnbodncodSolaqqaC 100 
On the genus Edestus (title). By J. S. NEWBERRY......... .... 100 
Measurement of Instantaneous Photographic Exposures. By 
IW Gr LRVISON Soe fo ae ace spinicie sie soins oe s\tintetesraivians aetna 100 
(Continued on third cover page.) 
