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MECA
EPGRY MONACEASTS
EDITED BY
JOSEPH LOVERING,
Permanent Secretary.
CAMBRIDGE:
PRESS OF JOHN WILSON AND SON.
I. MATHEMATICS AND ASTRONOMY.
1. Note on certain Involutes of a Circle, and on the analytical value of the Hyperbolic Base.
By THOMAS HILL
2. On a new method of determining the Level Error of the Axis of a Meridian Instrument. By
C. A. YOUNG
21
.
4. The Velocity of Nebula-Rotation. By JACOB ENNIS
5. Cosmogony. By L. BRADLEY
3. The discovery of the Force which originally imparted all their Motions to all the Stars. By
JACOB ENNIS
40
47
6. Description of a new form of Mercurial Horizon, in which vibrations are speedily extin-
guished. By J. HOMER LANE
59
II. OPTICS.
1. On Dispersion and the possibility of attaining perfect Achromatism. By EDWARD C.
PICKERING
2. On methods of Illustrating Optical Meteorology, particularly the formation of Halos and
Coronæ, according to the theory of Bravais.
62
64
70
IV. ELECTRICITY.
1. Abstract of a research on a simple method of measuring Electrical Conductivities by means
of two equal and opposed Magneto-Electric currents or waves. By ALFRED M. MAYER
3. Description of an Arctic Tide-Gauge. By JOHN M. BATCHELDER
4. The Isothermals of the Lake Region. By ALEXANDER WINCHELL
VI. CHEMISTRY AND MINERALOGY.
1. A graphical discussion of the various formulæ proposed for the relation between the Quan-
tity of Light produced by the Combustion of Illuminating Gas and the volume of Gas
consumed. By FREDERICK E. STIMPSON
2. On the examination of the Bessemer Flame with colored glasses and with the spectroscope.
By JUSTUS M. SILLIMAN
3. On American Iron Sands. By T. STERRY HUNT
76
82
98
104
106
118
119
131
4. The parallel striæ or indented cross lines on Rock Crystals. By LEWIS FEUCHTWANGER .
132
VII. MOLECULAR PHYSICS.
1. Elasticity as a Feature in Physics. By S. J. WALLACE.
2. On the Assumption that Matter is Impenetrable By H. F. WALLING
136
144
3. Remarkable case of Freezing Fresh Water in Pipes Submerged in Salt Water. By W. W.
WHEILDON.
147
B. NATURAL HISTORY.
I. GEOLOGY AND PALEONTOLOGY.
1. The Laurentian Apatites of Canada. By GORDON BROOME
2. The Oil-bearing Limestones of Chicago. By T. STERRY HUNT
3. Notes on Granitic Rocks. By T. STERRY HUNT
4. On the Former Existence of Local Glaciers in the White Mountains. By LOUIS AGASSIZ
5. Boulder-trains in Berkshire County, Mass. By JOHN B. PERRY
6. The Supposed Elevation and Depression of the Continent during the Glacial Period. By
JOHN B. PERRY. .
169
7. Remarks on the Relative Age of the Niagara and the so called Lower Helderberg Groups.
By A. H. WORTHEN.
172
8. The Distribution of Maritime Plants in North America a proof of Oceanic Submergence in
the Champlain Period. (Abstract.) By C. H. HITCHCOCK
175
9. Lakes and Lake Regions. By S. J. WALLACE
10. On the Evidence of a Glacial Epoch at the Equator. By JAMES ORTON
182
185
II. ZOOLOGY.
1. On the Homologies of some of the Cranial Bones of the Reptilia, and their bearing on the
systematic arrangement of the class. By EDWARD D. COPE
194
2. On the Embryology of Limulus Polyphemus. By A. S. PACKARD, Jr.
247
3. On the Young of Orthagoriscus Mola. By F. W. PUTNAM .
255
4. On the Condors and Humming Birds of the Equatorial Andes. By JAMES ORTON.
260
5. On the Relations of the Order of Mammals. By THEODORE GILL
267
6. On the Early Stages of Discina. By EDWARD S. MORSE
7. On the Organization of Lingula and Discina. By EDWARD S. MORSE
8. The Brachiopoda, a division of Annelida. By EDWARD S. MORSE
270
271
272
III. BOTANY.
1. The Law of Fasciation and its Relation to Sex in Plants. By THOMAS MEEHAN
276
2. On Objections to Darwin's Theory of Insect Agency in the Fertilization of Plants. By
THOMAS MEEHAN
280
3. On two classes of Male Flowers in Castanea, and the Influence of Nutrition on Sex. By
282
4. Observations on Seedling Compass Plants. By THOMAS HILL
285
5. Investigation of the Development of the Yeast or Zymotic Fungus. By THEODORE
HILGARD
287
1. On some peculiarities of the Eskimo Dialect. By WILLIAM H. DALL
C. PRACTICAL SCIENCE.
I. MECHANICS.
1. On proposed Improvements for Common Roads. By SAMUEL D. TILLMAN
2. On Improvements in Inland Navigation. By SAMUEL D. TILLMAN
PAPERS PRESENTED, BUT ONLY PUBLISHED BY TITLE
EXECUTIVE PROCEEDINGS.
332
349
354
358