3 
<j 
eX IL. 
Xt. 
XV. 
XVI. 
XVIL. 
CONTENTS. Vv 
NUMBER II. 
Page. 
- Observations upon certain ein and vasa sbawennig 
ena; by ALEXANDER C. TWININ 217 
- Geological and i Sh Notices ; by Prof. wher 
P. Hupsarp, M 
- On the Economical thee: of some species of Testacea, 235 
. Criticisms and suggestions respecting Nomenclature; by 
Prof. Rozert Hart, M.D. Also, a Letter from the 
celebrated J. J. Berzetius, — - 259 
- Description of an Electrical Machine, with a Plate four 
feet in diameter, so constructed as to be above the Ope- 
rator: also, of a Battery Discharger employed there- 
with: and some Observations on the Causes of the Di- 
versity in the Length of the Sparks erroneously distin- 
guished by the terms Positive and tba sae Prof. 
R. Hare, M.D. &c. 272 
. Of an Improved Barsiecll Gage Bodiomeuy? ; by Prof 
R. Hare, M.D. &c. - 
. Engraving and Description of Voltaic Series, coats 
the advantages of the trough of Cruickshank with those 
of the Deflagrator; by Prof. R. Harz, M.D. &c. —- 285 
. A Natural System of Botany; or a systematic view of 
the Organization, Natural Affinities, and Geographical 
Distribution of the whole Vegetable Kingdom; together 
with the uses of the most important species in Medi- © 
cine, the Arts, and rural or domestic ene A by 
Joun Linpiey, Ph. D.'&c. ee 29: 
° Electro Meteenioge Observations oe Jas. ee 304 
. Expe n the | of Met s; by 
Joun B. Zanntani M.D. 
. Description of the model of an Electro- Magni Hage 
3 
constructed by Joun B. Zaprisxiz, M. 13 
On Zine Roofing; by Prof. L. D. Gaz, - - 315 
On the Common Blowpipe; by Prof. J. W. Bartey, 319 
Notice of the Gold Veins of the United States’ Mine near 
Fredericksburg, Va. ; bY Lieut. + F nie U. S.N. 325 
Chronometers 330 
Chemical Framisstioit of Mirotite: by Prof, Cisne - 
Urnam Surparv,M.D. - -— - 8 
Notice of Eremite, a new Mineral — ty P Prof, 
Cuarues U. SuEparp, M.] 
