CHRONOLOGY liii 



1843 



March 11. — At fifty-eight, sets out with four companions for 

 the region of the Upper Missouri and Yellowstone Rivers, 

 but is unable to attain his long desired goal, the Rocky 

 Mountains. 



November. — Returns with many new birds and mammals. 



1845-1846 



The Viviparous Quadrupeds of North America, in collabora- 

 tion with the Rev. John Bachman, issued to subscribers 

 in 30 parts of five plates each, without letterpress, making 

 two volumes, imperial folio, at $300.00. 



John W. Audubon, traveling in Texas, to collect materials for 

 his father's work. 



1845 



Engrossed with drawings of the Quadrupeds, in which he re- 

 ceives efficient aid from his sons. 



July 19. — Copper plates of The Birds of America injured by 

 fire in New York. 



December 24- — Bachman, his collaborator, issues ultimatum 

 through Harris, but work on the Quadrupeds, which had 

 come to a stand, is resumed. 



181^6-1847 



John W. Audubon in England, painting subjects for the illus- 

 tration of the Quadrupeds of North America. 



1846-1854 



The Viviparous Quadrupeds of North America, in collabora- 

 tion with John Bachman, published in three volumes, 

 octavo, text only, by J. J. and V. G. Audubon; volume i 

 (184-7) only appeared during the naturalist's lifetime. 



