CONTENTS. 
Page 
MRT WER CRLEYID, 22 De 28 so a ag es a he a i Sn VII 
Beaming Sirles of TnasSOeleby aos as ee IX 
Standing Rules of the General Committee..___.______ _---__ -____- XII 
Hules for the Publication of the Bulletin... _.____ -_-___ _-___. XITE 
Oficers! elected! Mecember, 1884 2222.48. 22 oo se a eo oe XIV 
Oiticers. elected, December, 1885). ah oe XV 
ee WERE HS ea Sh i at i i eee, EVI 
SumenAmecesnod. MOM BOIS. co) 6 SS. 25) oo le ee XXV 
MOnealbaport of the Secretaries: oo6 46. +225 aa. ae. KXVII 
Annual Report of the Treasurers... ....2--___ =.= -_.- XXVIII 
OE Rr eS COS ee eS ae epee eS a=, * ERR 
Annual Address of the President, Asaph Hall -___ -----_-__. ----_. XXXIII 
Protector the General Machine 8 oe eh a ee ee ses 1 
Keport of the Auditing Committee..______. __.-.. . —_--— .. sof 3 
The vital statistics of the Tenth U.S. Census, J. S. Billings, 
PETS ECOPEDN het 25 eke ey SBE See RI tee 4 
Recent experiments on reaction time and the time sense, G. 
Stumleyy tall. (Pirle omle) sso oo oe et 4 
Practical geology versus speculative physics, C. E. Dutton, 
CAPOORME) oi Se a eed sie is ee es we «AYE 
Topaz from Stoneham, Maine, F. W. Clarke and J. 8. Diller, 
y (Title only) ---.--------—- -- .- ---------- ---- ---- -------- 5 
Two remarkable forms of mollusks, W. H. Dall___-.-______- 5 
Geological and physical theories, W. B. Taylor._____-___ -_-- 6 
Methods of verifying weather predictions, C. Abbe__-------_ 8 
Marratrons: Ofiatitude: AVS Ela aa) 5 oa 10 
Mhunderstorms;or 1884, Hi. Aw azen fe ee 10 
The Javal and Schiotz ophthalmometer, 8S. M. Burnett, (Title 
OU) aoe es wie oe Sees oc amen ne ode eo aoe 11 
The difficulty in determining the direction of sound, A. B. 
OU S ON tae eee eee ee eens Pit leatsyl seed Salah 11, 12 
Mythological dry painting of the Navajos, W. Matthews -__. 14 
Comets II and III, 1884, W. C. Winlock ~__.-____-__... .-.. 16 
Problems connected with the physics of the earth’s crust, H. 
BIO ictRe Le eNO) bent a te Se pe rt 17, 18 
Modern ideas of brain mechanism, F. Baker, (Title only)-_---- 17 
The flora of the Laramie group, L. F. Ward, (Title only) ---- ily) 
The measurement of temperature at distant points, T. C. Men- 
LEN a) ee eee 18 
The asteroids, G. L. Ravene, (Title only y) neh Pana VEST Cal te ae 18 
Tit 
