452 Bibliography. 



5. Plants employed in the Arts, in Commerce, in Domestic or Rural 



Economy. 



6. Pernicious plants. 



7. Plants which are mere weeds. 



No one has devoted himself more sedulously than our author, to pro- 

 mote the true interests of agriculture, to inculcate a sense of the dignity 

 and elevated character of the pursuit, and the importance of science to 

 those engaged in it. This is proved by numerous addresses, lectures, 

 and publications, a list of which we here annex. 



1. Address, at the Third Annual Meeting of the Pennsylvania Agri- 

 cultural Society, held at Prospect Hill, Philadelphia Co., Oct. 21, 1825. 



2. Address to the Chester County Cabinet of Natural Science, at the 

 organization of the Society, March 18, 1826. 



3. Florida Cestrica : An Essay towards a Catalogue of the Phaeno- 

 gamous plants, native and naturalized, growing in the vicinity of the 

 Borough of West Chester, Pa. April 28, 1826. 



4. Flora Cestrica: An attempt to enumerate and describe the Flow- 

 ering and Filicoid Plants of Chester County, Pa. April, 1837. 



5. An Essay on the Development and Modifications of the External 

 Organs of Plants. Compiled chiefly from the writings of Goethe. 

 March 1, 1839. 



6. A Discourse on the Character, Properties, and importance to Man, 



of the Natural Family of Plants, called Graminese, or True Grasses. 

 February 19, 1841. 



7. Address to the New Castle County Agricultural Society and Insti- 

 tute at the Eighth Annual Meeting, held at Wilmington, Del., Sept. 

 Io, 1843. 



8. A Lecture on the Study of Botany ; read before the Ladies' Bo- 

 tanical Society, at Wilmington, Del. March 2, 1844. 



9. Address delivered before the Philadelphia Society for promoting 

 Agriculture, at the Annual Axhibition, October 17, 1844. 



10. Address before the Chester County Horticultural Society, at 

 their First Annual Exhibition, in Westchester, Pa. Sept. 11, 1846. 



1L Agricultural Botany : An Enumeration and Description of 

 Useful Plants and Weeds, which merit the notice, or require the atten- 

 tion, of American Agriculturists. June, 1847. 



nd 



ng of citizens of Ox- 



A <U* *lio nnrnnsfi 01 



lorming an Agricultural Society, September 4, 1847. 



3. Foraminiferes fossiles du bassin tertiaire de Vienne, decrits par 

 Alcide D'Orbigny. 4to, with numerous plates. Paris, 1846.— When 

 « was asserted, many years since, by Lamarck, that more had been 

 contributed to the formation of the ea'rth's crust by microscopic shells, 

 than by whales, mammoths and hippopotami, comparatively little was 

 known as to the real extent of the labors of the minute but beautiful beings 

 called Foraminifera by d'Orbigny, and Polythalamia by Ehrenberg. 

 Thanks to the labors of the eminent naturalists just named, the im- 

 mense importance of these minute creatures as architects of the earth s 

 crust is now generally known. D'Orbigny in particular has devoted 

 almost a lifetime to their study, and until Ehrenberg investigated the 

 still more minute forms of this class, the former naturalist was almost 

 the only worker in this field. 



