xiv c: N T E N r S . 



ARTICLE V. MosASAuiius and 'iiie TimiiE Allied Ni:w Gkneka, IIolcodus, Co.nosaurls, and 

 Ampiioiiosteus. By Robert W. Oiubk.s, M.D. Pp. 14, and three plates. 



ARTICLE VI. The Classificatiox of Insects from EiMuuvoLOGicAL Data. By Prof. Louis 

 Agassiz. Pp. 28, and one plate. 



General Considerations, . . . . . . .3 



The Metamorphoses of Eudamus tityrus, .... 8 



Special Classification of Lepidoptera, . . . . .14 



Remarks upon the Metamorphoses of some Dipterous Insects, . . 18 



_ Relative position of the Classes of Articulata, . . . .20 



ARTICLE VII. On the Explosiveness of Nitre, with a view to elucidate its Agency in the 

 TREMENDOUS ExpLosiON OF JuLY, 1845, IN New York. By Dr. Robert Hare. 

 Pp. 20. 



ARTICLE VIII. Microscopical Observations made in South Carolina, Georgia, and Florida. 

 By Prof. J. W. Bailey. Pp. 48, and three plates. 



Localities visited in the South, ...... 4-26 



Species found in Wainskut Pond, near Providence, R. I., . . 27 



Table A. — Showing the Geographical Distribution of the Dei>midieae ob- 

 served, . . . . . . .28 



Table B. — Showing the Geographical Distribution of the Diatomaceaj, 31 



Table C. — Showing the Geographical Distribution of the Infusoria, . 33 

 Table D. — List of Algae referred to, . , . . . 35 



Descriptions of new Species, ...... 36 



General Remarks, ....... 42 



Appendix, ........ 45 



Explanation of Plates, . . . . . . 47 



ARTICLE IX. Aboriginal Monuments of the State of New York, comprising the Results of 

 Original Surveys and Explorations; with an Illustrative Appendix. By 

 E. G. Squier, a. M. Pp. 188, and fourteen plates. 



I. Introductory Observations, . . . . ~ • ■ 9-13 



II. Earth-Works; Enclosures, etc., . . . • • 15-16 



St. Lawrence County, . . . . • • .16 



Jefferson County, . . . . " • • ^ ' 



Oswego County, ....••• 26 



Onondaga County, . . . . . ■ . . . 27 



Madison County, . . . ■ • • .32 



Otsego County, .....•• 33 



Chenango County, ....••• ^3 



Cayuga County, . . . • • • • ^^ 



Chemung County, .....•• 38 



