( 21 ) 



and bibliugr.ipliical of the progress of iiifonnfttion aud opmioii res- 



pectiug vestiges of untiquity in tbo Uuitcii Klatcs. 

 D. OLMSTEAD. Ün the recent secular peviod of tho Aurora Boreaüs. 

 n. ALVORD. The tangcncies of circles and of sphercs. 

 j. joNES. Researches chemical and physiological, concerning certain 



North-Amcrican Vertebrata. 



Tent arniual report of the board of regents of the Smiths- 

 onian institution. Washington 1856. 8°. 



Memoirs of the American Academy of arts and sciences. 

 Vol. V. 2. N. S. Cambridge and lioston. 4\ 



Contents : 



A. DE JOSSIEÜ. CAEOH A LINNÉ ad BERNARDOM DE JÜSSIEO ioeditaO, et 



mntaao bernakdi ad linnaeüsi epistolae. 

 j. p. cooKE. The numerical relation bclwcen tho atomic weights, with 



some thoughts on the classification of the chemical clements. 

 D. n. STORER. A history of tho tishoa of Massachasetts. 

 ASA GRAY. Plantae Novae Thurbcrianae. 

 On the affinities of the geuus Vauaea beniii. ; also of lUi^- 



tidandi-a guat. 

 j. p. COOKE. On two new crystalline compounds of zinc and antimo- 



ny, and on the cause of the variation of composition observed in 



their crystals. 

 A, x>. bache. Discussion of observations for the isodynamic, isogonic 



and isoclinal curves of terrestrial magnctism on and near the line of 



the boundary survey betweeu the United States and Mexico, made 



in 1S49-I852. 

 j. HALL and F, B. MEEK. Descriptïons of new species of fossils, from 



the cretaceous formations of Nebraska, with observations upon Bacu- 



lites ovaliis and B. Compresses, and the progressive development of 



the septa in bacnlites, ammonites and. ecuphites, 



Proceedings of the American association for the advan- 

 cement of science 2, 7, 8, 9, meeting. Cambridge 1850, 

 1855, 1856. 8^ 



Address before the American association for the advance- 

 ment of science. 8^ 



Journal of the Academy of uatural sciences of Phüadel- 

 phia. N. S. Voh III. p. 2. Philadelphia 1855. 4". 

 Contents: 



j. G, KORWOOD and n. pbatten. Nolice of fossÜs from the cavboni- 



