Memoir of William Maclure. 17 



5. Remarks on the Igneous Theory of the Earth. Vol. XVI, 



p. 351. 



6. Geological Remarks relating to Mexico. Vol. XX, p. 406. 

 The same periodical also contains many detached observations, 



and fragments of letters communicated to the editor of that work. 

 Memoirs published in the Journal de Physique, de Chimie et d'His- 

 toire Naturelle, Paris : 



1. Extrait d'une Lettre de M. William Maclure, a J. C. Delame- 



therie, sur la Geologie des Etats Unis. Tome 69, p. 201. 

 (1809.) 



2. Observations sur la Geologie des Etats Unis, servant a expllquer 



une Carte Geologique. Tome 69, p. 204. (1809.) 

 This last memoir is a translation from the original in the Transac- 

 tions of the American Philosophical Society. 



Note. — The Hall of the Academy of Natural Sciences of Philadel- 

 phia is situated at the corner of Broad and George streets — forty five 

 feet front on the former, and eighty five feet in depth on the latter. 

 The building is fire-proof, and presents a single saloon with three 

 ranges of galleries, beneath which, in the basement, is a lecture-room 

 capable of accommodating four hundred persons. 



The institution was founded in 1812, and incorporated in 1817, and 

 enjoys a perpetual exemption from taxation by legislative enactment. 



The Museum embraces extensive collections in every department of 

 of Natural History, arranged according to the most approved systems, 

 viz. 



2,500 Minerals. 



3,000 Fossil Organic Remains. 



10,000 Species of Insects. 



2,400 Species of Shells. 



1,000 Species of Fishes and Reptiles. 



1,300 Species of Birds ; a small but valuable collection of Quadru- 

 peds, and an extensive series of Comparative Anatomy. 



The Herbarium contains about 35,000 species of plants, arranged 

 according to the natural system. 



The Library embraces 7,000 volumes, and is always accessible to 

 members, and to visitors attended by members, excepting only those 

 occasions when the Academy is open to the public, viz. on the after- 

 noons of Tuesday and Saturday. Admission free of charge. 



Vol. sLvii, No. 1, — April-June, 1844. 3 



