230 



The following is the time of appearance of our species of Anura, as 

 observed about Cambridge during the present season : — 



Hyla versicolor Le C, Tree-toad, about the middle of April. 



Hylodes Pickeringii Holbr., Piping-frog. April 6. 



Bufo americanus Le C, Toad. April 7. 



ScapMopus solitarius Holbr. April 19. 



Rana sylvatica Le C, Wood-frog. April 11. 



Rana palustris Le C, Spotted-frog, Marsh-frog, or Pickerel-frog. 

 April 18. 



Rana halecina Kalm., Spotted-frog or Marsh-frog. April 6. 



Rana fontinalis Le C, Green-frog. April 11. 



Rana Catesbiana Shaw, (R. pipiens of authors,^ Bull-frog. About 

 the middle of April. 



The following letters were read, which had been recently 

 received, namely : — 



From the Smithsonian Institution, July 2 2d, and Aug. 19th, 1862; 

 K. K. Geologische Reichsanstalt, Wien, September 29th, 1862 ; K. K. 

 Central Anstalt, Wien, October 7th, 1862; K. Akademie der Wis- 

 senschaften, Wien, November 1st, 1862 ; Institut Imperial de France, 

 Paris, October 20th, 1862 ; K. U. Bibliothek zii Gottingen, December 

 16th, 1862 ; Leeds Philosophical and Literary Society, December 3d, 

 1862; Verwaltungsrath der Zoologischen Gartens, Frankfurt, Janu- 

 ary 8th, 1863 ; acknowledging the receipt of the Society's publica- 

 tions. From the K. Hof-und-Staats-Bibliothek, Mlinchen, November 

 6th, 1862, acknowledging the same, and asking that missing numbers 

 may be supplied. From the K. Bayerische Akademie der Wissen- 

 schaften, Munchen, November 6th, 1862, acknowledging the same, 

 and presenting various publications. 



May 20, 1863. 

 The President in the chair. 



Prof. Wyman, in exhibiting the stomach and heart of the 

 " white whale," offered some additional remarks to his for- 

 mer communication on the same subject. 



Mr. S. H. Scudder gave an account of the distinct zones 

 of life on high mountains, as illustrated in the entomology of 

 the White Mountains of New Hampshire. 



He recognized, as had been done in the Alps of Exirope, three re- 



