TABLE OF CONTENTS. ix 
PAGE 
‘On Preparing and Preserving the Odontophores of Mollusca (Febru- 
AERATED Y ha (ooh ch ata Vere Ala) a, TAs <eepayn no ick ,0i Wale! <t2int Sie sale halal bay adal phe let 158 
Some Notes on Obtaining Photographic Representations of Objects 
of Natural History by means of the Microscope (March 13, 
I cha cpnth cesium seis ely Math AEE Nea hate a) oi Gea) sid cg tse oii’ « wie oe 189 
Notes on some Microscopic Organisms CAprrl OS i l)tce mee: veers 205 
Note accompanying three Photographs of Degeeria domestica as 
seen with Black Ground Illuminations (October 9, 1871)........ 256 
Note on Colored Rain (October 23, 1871)...... ....c cece ecu eeeecees 272 
Description of a new form of Achromatic Prism for Illuminating 
Microscopic Objects (December 4, 1871)..............00.:2 0008 299 
THOMAS EGLESTON. 
‘Progress of Metallurgy in Europe (October 2, 1871)................. 253 
Artificial Coloration of Agates (October 23, 1871).. ................ 270 
‘The Sand Blast Machine (November 6, 1871).................... .. 281 
HERMAN ENDEMANN.,. 
On Meat and Methods of Preserving it (November 13, 1871)........ 28 
LEWIS FEUCHTWANGER. 
A New American Locality for Cobalt and Nickel (November 21, 
CHARLES FROEBEL. 
Notes of some Observations made in Dakota, during two Expedi- 
tions, under command of General Alfred Sully, against the hos- 
tile Sioux, in the years 1864 and 1865 (Oct. 17, 1870)... ........ 64 
A. H. GALLATIN, 
Note on the Absorption Bands of Hzmatin and Cruorin (February 
Vy, Lol Baik RRL AES Ait Tekh ae TR EA el a ar eae Re rae aA 173 
G. K. GILBERT. 
‘Some Facts in regard to the Surface Geology of the Maumee Valley 
(Bebriary 20M LSM) sie sas Cee UE ee ee ARCA ee 175 
Remains of a Mastodon (April 17, 1871).......:.... 0 .........4. Saag AL 
A. HABEL, 
‘The Mode of Occurrence of the Whuano (Guano) on the Chincha 
Hislaricl sy (Miaivaleed Onan aue tactiaerette thot carsales k's «olcete enone eters 225 
B. WATERHOUSE HAWKINS. 
Baport of Progress of Work Accomplished at the Paleontological 
Museum in the Central Park, New York (March 6, 1871)...... 179 
On a Specimen of Ichthyosaurus (April 3, 1871).................. . 202 
