CONTENTS. 



Art. I. — Observations on Invisible Heat-Spectra and the 

 recognition of hitherto unmeasured Wave-lengths ; by 

 S. P. Langley. With Plates I to IV, _ 1 



II. — Botanical Necrology of 1885 ; by Asa Gray, , 12 



III. — The Isodynamic Surfaces of the Compound Pendulum ; 



by F. E. Nipher, 22 



IV. — The Peridotites of the " Cortlandt Series" on the Hud- 

 son River near Peekskill, N. Y.; by G. H. Williams, 26 



V. — Description of a Meteorite from Green County, Tenn.; 



by W. P. Blake, 41 



VI. — Tendril Movements in Cucurbita maxima and C. Pepo ; 



by D. P. Penhallow. With Plate V, 46 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — A new Magnesium Carbonate, Engel : Chlorine monox- 

 ide, Garzarolli-Thtjrnlackh and Schacherl, 57. — Lupanine, the alkaloid of 

 Lupine, Hagen: Relation between Molecular Structure and Light-absorption, 

 Hartley, 58. — Variation of Refractive Indices with Temperature, Dufet, 59. — 

 On a Spectroscopic Optometer, Zenger, 60. — Magnetization by an Electric Dis- 

 charge, Claverie, 61. — Velocity of Light in Air and refractive media, New- 

 comb, 62. — Theoretische Optik, gegriindet auf das Bessel-Sellmeir'sche Princip, 

 E. Ketteler, 64. — Magnetic and electrical properties of the iron carburets, 

 C. Barus and V. Strouhal, 67.— Joseph Henry and the Magnetic Telegraph, 



E. N. Dickerson : " The Force Function in Crystals," A. Einhorn, 69. 

 Geology and Mineralogy. — The Missouri Coteau and its Moraines, J. E. Todd, 69. 



— Geological Survey of Pennsylvania, J. P. Lesley, State Geologist, 70. — Atlas 

 von China, Orographische und Geologische Karten, F. F. Von Richthopen: 

 Swedish Geological Survey: Earliest (Devonian) winged Insects of America, 

 S. H. Scudder, 71. — Footprints on the Triassic Sandstone of New Jersey, J. 

 Eyerman: Cervus Americanus in "Warren Co., New Jersey: Pteropod of the 

 St. John Group : Annuaire Geologique Universel et Guide du Geologie, Dr. 

 Dagincofrt, 72. — Chlamydoselachus anguineus, S. Garman: South Carolina, 

 Resources and population, etc.: Kobellite from Colorado, H. F. and H. A. Kel- 

 lar, 73. — Crystallographic Notes, 0. W. Huntington: Mineralogical Notes, G. 



F. Kt/nz, 74. — A Mt. Blanc Fulgurite, 77. — Fifth Annual Report of the State 

 Mineralogist of California, H. G. Hanks, 78. 



Botany. — Manual of the Botany of the Rocky Mountain Region, J. M. Coulter, 



76. — Sir Joseph Hooker, 77. 

 Astronomy- — Meteors of November 27, 1885, 78. 

 Obituary. — Dr. John Christopher Draper, 80. 



TEN-VOLUME INDEX. 



An extra number of this Journal, containing an index to volumes xxi to xxx, 

 of sixty pages or more, is nearly ready for distribution. The publication of this 

 number involves a large extra expense to the editors, and it will be sent, there- 

 fore, to those only who specially order it. The price is seventy-five cents per 

 copy. Orders are solicited, as the edition will be a small one. 



