American Association for the Advancement of Science. 315 



2. Notice of a Chronometric Expedition for ascertaining the differ- 

 ence of Meridians of Greenwich and Cambridge Observatories, by W. 

 C. Bond. 



3. Remarks on the Occulation of Aldebaran observed at Nantucket, 

 by William Mitchell. 



4. Determination of the Water contained in Crystallized Sulphate of 

 Quinine, and a method for testing the purity of the commercial article, 

 by Dr. C. Ltnck. 



5. On a New Method of Observing Right Ascension and Declination, 

 by Prof. Mitchell. 



6. On the Fat of a large Sea Turtle, by Dr. C. Linck. 



SCCTION OF NATURAL HISTORY, GEOLOGY, &c. 



1. Observations on the Brachiopoda, &c, by Prof. Hall. 



2. Remarks upon Graptolites, their duration in Geological Periods, 

 and their value in the Identification o[ Strata, by Prof. Hall. 



3. On the Geological Structure of Eastern Canada, by T. S. Hunt. 



4. On the Mineral Region of Lake Superior, by James S. Hodge. 



5. On the Sediment of the Mississippi, by W. Mark, U. S. N. 



6. Letter on a New Cave in Kentucky, by L. Feuchtwanger. 



7. On the Right Whale of the Southern Hemisphere, by Lieut. 

 Maury. 



8. On the plan of Structure and Homologies of Radiated Animals, 

 with reference to the systematic position of the so-called Hydroid 

 Polypi, by Prof. L. Agassiz. 



9. On the Homologies of Acephala and Gasteropoda, with reference 

 to the systematic position of Brachiopoda, &c, by Prof. L. Agassiz. 



10. On the Differences ^between Sirenidea and true Cetacea, and the 

 Embryonic Characters of # the former, by Prof. L. Agassiz. 



11. On the Difference between Embryonic and Prophetic Types in 

 |ne succession of organized beings through the whole range of geolog- 

 ical times, by Prof. L. Agassiz. 



12. On Bone Caves of Pennsylvania, by Prof. Baird. 



13. On the Genus Phalangopsis, by S. S. Haldeman. 



14. On the Metamorphosis of the Urodelian Batrachians, by Prof. 

 Baird. 



15. On the Skulls of the smaller Mammalia of Massachusetts, by 



Dr. Wheatland. 



general meeting : evening session, (in Lyceum Hall, 7 J o'clock, p. m.) 



1- On Animal Morphology, by Prof. Agassiz. 

 , 2 - On Linguistic Ethnology, with illustrations chiefly from the Abo- 

 r, ginal Languages of America, by S. S. Haldeman. 



Tuesday, Aug. 21, 10 o'clock, A. M. [The last day of the Session.] 



section of physical chemistry, &c 



1. On Meteorological Instruments, by Prof. Guyot. 



2. Remarks on a proposed Prime Meridian for American Longitude, 

 b y Prof. Holton. 







