292 



Pheiiological calendar for Giessen. 

 [Lat. 50° 35' N. ; long. 8° 12' east of Greenwich ; altitude, 160 meters.] 



(B) Smithsonian list. — In the United States calls for phenological 

 observations were issued by the New York Agricultural Society in 

 1807 and by the Regents of the University of New York about 1820, 

 also by Jo.siah Meigs as Commissioner of the General Land Office in 

 1817, but the principal work has been that undertaken by Prof. 

 Joseph Henry, who as Secretary of the Smithsonian Institution estab- 

 lished in 1818 a system of phenological observations undoubtedly 

 arranged by Dr. Asa Gray or Dr. Arnold Guyot, and subsequently 

 published a revised list of plants and epochs. 



This system was also promulgated by the Department of the 

 Interior on behalf of the Patent Office and its Bureau of Agriculture 

 requesting accurate observations. The following is an abstract of 

 Doctor Gray's schedule, which is here produced, because we shall 

 have occasion to quote observations made on this plan, which was a 

 slight modification of Quetelet's plan. 



The observations thus collected by the Smithsonian, 1854-1859, 

 were used by Fritsch in his memoir and list quoted on page 191. 



The following observations were requested by the Smithsonian 

 Institution : 



