CONTENTS. Vii 
NUMBER LIX. 
Art. XLI.-—On the Variation in the sirens of a Muscle ; 
Ancis EK. Nipuer, - 
XLIT—Studies on age the Distribution; ; by. HA. Row.anp, 598 
XLIIL—The Effect of the Glac Epoch upon the Distribu- 
tion of Insects in North rece by Aue. R. Grore, 335 
eee and its Terminology; b ¥, =: 839 
XLV.—Abstract of a Memoir on the “ pines agg Relations 
of the Jura win Ammonites ;” by A. Hyatt,_..-.------ 344 
XLVI—Meteoric Iron, Dickson oy Veen ; by J. L. Smirn, 349 
XLVIL—Specific Gr: ravity Balance; by Roswett PaRisH,-- 352 
XLVIiI.—On Southern New England during the Melting of 
mes D. Dana. No. III, 3 
XLIX.—Iowa County Meteor; by N. R. Learns cee tes 357 
L.—On the Rit pire fossils of Sankoty Head; by A. E. 
VERRILL ; with a note on the Geology;by S. H. Scupper, 364 
Appenpix.—LI,—On the Odontornithes, or Birds with Teeth; 
we OO; 6 Magee, osu. 2 cee, bes be a eee 403 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Pi Phasice- — Trimethyl-carbinol, FReunD, 375. — 98 Sip ae 
of Epihisciytes, 2 vost: On Three new Pinacolins, Wise 
—Salylie acid idontical with Benzo: nzoic, KouBpe: On the Pateeien eats ‘a 
Chlordracylic acid, Hartmann: Use of Salicylic acid in Titrition, WEISKE, 377. 
—Synthesis of Malonic acid, Pinner: Action of Chlorine on Pyrogall 1, STEN- 
HOUSE: Constit of Emodin. aR TRS 78.—Coloring Matters Phlore 
in, B: : Arithmetical relations between the A e 
ti ‘ 
weights, IRa Remsen, 379. —Compressbiity of of aene oe REWS, 380.— 
Magnets formed of Tron m Filings, J HARME, 382. 
Geology and Natural History. ies as eh upon eats ache var Mt. Washington, 
C. H. Hrrexcock, 383.—Report on the vicinity of the 49th Parallel from the 
Lake of the Woods to the Rocky Mcuntaina: by G. M. Dawson, 384.— rt 
of a Reconnaissance of the — pag of Dakota i in of 1874; by | i term 
i Ohio: Cretaceou 
Mexico; by M. BaRcENa, Cf aa paths Sey iakine, 0. ro 387, —Sedi- 
ts 0: b 395.—F fe 
E. S. Morsz, 396.—The Bones, Ligaments, and Muscles of the Domestic Cat, by 
H. S. Winurams: Leraata ys polyps of the Umbellularia group, 397. 
Astronomy.—Observations de Poulkova; OTTo ee a 
Scientific Tntelligence.—Journal of the Scottish Meteorological Society, 
398.—Voyages a la Cote Nord-Ouest de I’ Amérique, 1870-72, A. be PINART: 
Index of Professional |in the 400.— 
‘o Medical Jurisprudence and Medicine; by A. S. TAYLor: S Lion 
mr a , by S. Haventon, 402.—Obituary.—W. J. Henwood: 8. D. Till- 
