INTRODUCTION. vii 



Section 1. — Mathematics, Astronomyj and Physics, 

 embracing Natural Philosophy and Mechanics.— Chair- 

 man, L. Brajvtz. 



Section 2.— Chemistry. — Chairman, J. T. Ducatel. 

 Section 3. — Mineralogy and Geology, including Phy- 

 sical Geography, and the history and classification of 

 Fossil remains — Chairman, P. T. Tyson. 



Section 4. — Zoology, embracing the comparative ana- 

 tomy and physiology of animals — and further divided 

 into six classes, viz : on the history and classification 

 of Mammalia — Birds — Reptiles — Fishes — Insects, and 

 Mollusca. — Chairman, R. E. Griffith. 



Section 5. — Botany, including Vegetable Physiology. 

 Chairman, W. E. A. Aikin. 



In this state of things, a renewed appeal is confi- 

 dently made to the American public, to similar institu- 

 tions in this and other countries, and to the lovers of 

 nature all over the world, to aid in furthering the 

 objects of the Academy by contributing whatever they 

 may have to spare in books, specimens of natural his- 

 tory, and other objects of interest. As announced in a 

 previous circular, 'the collections which the academy 

 seeks to make, embrace all that can claim the attention 

 of the literary and scientific. They include minerals, 

 shells, fossils, specimens in natural science, books, 

 coins, aboriginal antiquities, maps and documents illus- 

 trative of the history, geography, or literature of any 

 portion of the world, and in particular of Maryland. 

 Unpublished barometrical or thermometrical observa- 

 tions — descriptions of celestial or terrestrial pheno- 

 mena and state statistics which have never been given 



