148 



of Natural Sciences of Philadelphia, May 12. 1835.-5y Wal- 

 ter R. Johnson. 

 A Biographical Sketch of the late Thomas Say, Esq. Read before 

 the Academy of Natural Sciences of Philadelphia, December 

 16. 1834. By Benjamin H. Coates, M. D.—By the Academy. 

 Tables of Continental Lineal and Square Measures. By W. S. B. 

 Woolhouse, Head Assistant of the Nautical Almanac Establish- 

 ment By the AutJior. 



Prepared Specimens of the following Species of Fish were 

 presented by Dr Parnell : 



Tiigla Blochii. Salmo fario-Female. 



Aspidophorus lataphractus. Salmo salniulus. 



Gasterosteus trachurus. Gadus luscus. 



Blennius Pholis. Platessa vulgaris. 



Zoarcus viviparus. Platessa flesus. 



Belone vulgaris. Platessa pola. 



dupea Harengus. Microcephalus petrosus. 



dupea sprattus. Platessa Limandoides. 



Clupea alba. Solea vulgaris. 



Salmo eriox. Kaia radiata. 



Salmo fario— Male. 



The following papers were read : 



1. An Attempt to ascertain the Relative Positions of the 

 Athenian and Syracusan Lines before Syracuse, from 

 the Description of Thucydides. By Professor Dunbar. 

 The object of this paper was to ascertain the position of the Athe- 

 nian and Syracusan lines from the language employed by Thucy- 

 dides, particularly the prepositions. The author was led to examine 

 the account of these lines given by Goellen and Dr Arnold, in their 

 editions of Thucydides, and the maps they have subjoined, and to 

 compare them with the historian's descriptions. He pointed out the 

 error into which both seem to have fallen, respecting the fortifica- 

 tions of Temnites, as it did not appear, from the historian's state- 

 ment, that the district was entirely inclosed, but only that part 

 fronting Epipola-. He also endeavoured to shew that the cross 

 wall, built by the Syracusans, to intercept the Athenian lines in the 

 direction of Trogilus, could not have been constructed on the south 

 of the Temnites, as Dr Arnold supposes, but on the north of tlie 

 slope of Epipohe, and ihat it was not entirely destroyed by tlie 

 Athenians. 



