"EN RESA TIL NORBA AMERICA." 91 



it necessary to follow each notice through all the editions. 

 Our quotations are from the English edition of 1772, cor- 

 rected when necessary by the German rendering of the 

 same passages. 



The first notice met with is that on page 205 of volume 

 second, one that adds nothing whatever to knowledge of 

 the species : "Thousands of frogs croaked all the night long 

 in the marshes and brooks [Philadelphia]," 2nd Engl. ed., 

 Vol. i, 55 (1st Engl., I, 70 ; Ger., i, 221 ; Dutch, i, 33). 



A note of little more importance occurs on page 359 of 

 the same volume. In the German edition, Vol. n, 389, 

 this is rendered "Ausser den singenden und schwitzeruden 

 Vogeln von allerley Art, hielt sich gleichfals eine beson- 

 dere Gattung von Froschen in diesen Baumen, des Som- 

 mers, haufig auf. Selbige erfiilleten, an den Abenden, und 

 in den Nachten, vornamlich wenn die Tage heiss waren, 

 oder ein Regen zu kommenschien, die Luft mit ihren viel- 

 faltigen Geschrey, und stritten gleichsam mit den Vogeln 

 in die Wette. Dadurch erregten sie oft einen solchen Lerm, 

 dass einer auf der Gasse kaum recht verstehen konnte, was 

 d$r andere sagte." This passage in Forster's hand be- 

 comes "Besides numbers of birds of all kinds which make 

 these trees their abode, there are likewise a kind of frogs 

 which frequent them in great numbers in summer ; they 

 are Dr. Linnceus's Rana arborea, and especially the Amer- 

 ican variety of this animal. They are very clamorous in 

 the evening and in the nights (especially when the days 

 had been hot, and a rain was expected) and in a manner 

 drown the singing of the birds. They frequently make 

 such a noise, that it is difficult for a person to make him- 

 self heard," 2nd Eng., i, 194 (1st Eng., i, 249 ; Dutch, i, 

 108). There is nothing in Kalm's writing that warrants 

 the assertion that the tree frog mentioned was a variety of 

 the European form. Kalm does not say he saw the aui- 



