118 



Professor Lloyd and Major Sabine, relating to the preparation 

 for the undertaking. 



Professor Bache further stated, that on submitting the circular ad- 

 dressed to him by the Foreign Secretary of the Royal Society, with 

 extracts from the letters before referred to, and other information as 

 to the nature and importance of the results to be obtained by this 

 combined system of magnetic observations, to the Building Com- 

 mittee of the Girard College, through their Architect, they had, with 

 creditable liberality, given orders for the erection of an observatory 

 suited to the observations contemplated, and to the instruments already 

 in the possession of the Trustees of the College. 



Professor Bache submitted the plans of the observatory, drawn by 

 Thos. U. Walter, Esq. Architect. 



Mr. Justice made some remarks in continuation of those 

 offered at the last meeting of the Society, in support of his 

 opinion of a gyratory motion in the tornado of the 31st July, 

 the destructive effects of which were felt about seventeen miles 

 north of Philadelphia. 



Stated Meeting, October 4. 

 Present, twenty-one members. 

 Mr. Du Ponceau, President, in the Chair. 

 The following donations were received: — 



FOR THE LIBRARY. 



Memoires de l'Academie Royale des Sciences Morales et Politiques de 

 l'Institut de France. Vol. II. Second series. Paris, 1839. — 

 From the Academy. 



Institut Royal de France. Seance Publique Annuelle des Cinq Aca- 

 demies, 1839. Paris, 1839.— From Mr. D. B. Warden. 



Institut Royal de France. Seance Publique Annuelle de l'Academie 

 des Sciences Morales et Politiques, 1839. Paris, 1839. — From 

 the same. 



Recueil de Voyages et de Memoires publie par la Societe de Geogra- 

 phic. Vol. IV. Paris, 1839.— From the Society. 



