CONTENTS. 



Brochure i . First Annual Report of the Secretary. G. K. Gilbert. 

 Issued April 14, 1899. 



" 2. Revision of the Squirrels of Mexico and Central Amer- 



ica. E.W.Nelson. Issued May 9, 1899. 



•' 3. Synopsis of Mexican and Central American Umbelli- 



ferae. John M. Coulter and J. N. Rose. Is- 

 sued Jan. 8, 1900. 



" 4. Economic Development of the District of Columbia. 



Carroll D. Wright. Issued Dec. 29, 1899. 



*' 5. Political Development of the District of Columbia. 



Henry E. Davis. Issued Dec. 29, 1899. 



" 6. Coming of the White Man, and Founding of the Na- 



tional Capital. Ainsworth R. Spofford. Is- 

 sued Jan. 18, 1900. 



" 7. Description of a new genus and twenty new species of 



fossil Cycadean Trunks from the Jurassic of Wy- 

 oming. Lester F. Ward. Issued Feb. 14, 1900. 



" 8. Lower Cambrian Terrane in the Atlantic Province. 



Chas. D. Walcott. Issued Feb. 14, 1900. 



ILLUSTRATIONS. 



PLATES. 



I. Skulls of Mexican Squirrels. 

 II. Skulls of Mexican Squirrels. 



III. Mexican Umbellifers: Erynglurn galeotti, E . pauctsquamo- 



suin^ E. spiculosum. 



IV. *' «' lauschia Jiliformis, T. edulis, T. 



mariana. 

 ^ ' *' " Taiischia fnadrensis. 



* !• ** ** 7 anschia linearifolia. 



*^II' *' " Arracacia chiape?tsts. 



iii 



