CORRECTIONS. 



Page 173, 1. 20, and p. 180, No. 13. A cone of Pinus Gerardiana, just 

 received from the Kew Museum, shows that the wings of the seeds are as 

 small as any, and that, curiously enough, at least in this specimen, they 

 adhere, when the seeds drop out, to the back of the scale above the one 

 to which they belong. The description of Lambert of the wing of the seed 

 is therefore erroneous. The number of cotyledons is ten. 



Page 187, 1. 26. Pinus Tceda flowers immediately after P. australis, or 

 almost together with it, in this spring, 1880, in South Carolina, in the first 

 week of March. 



ERRATA. 



Page 82, line 10 from top, for " San Louis and St. Francisco," read St. 



Louis and San Francisco. 

 Page 83, line 18 from top, for " {A^—A.)" read {A^^A). 



" 83, " 20 " " " change," read increase. 



" 86, " 10 " " >?■'«= 9.56562 -j- 0.000916 « ," read 



k't =■ 9.56562 -(- 0.000192 ( . 



" 90, bottom line, for " r' tan u , " read r' tan u'. 



" 93, line 10 from bottom, for "change," read decrease. 



" 99, at the head of third column, for " i* , " read t' . 



r p ^ r I* ^ 



" I2Q, line 2 from bottom, for _ I ^^r^ read I _ - — — , 



I (2)2 J L (2)2J 



" 138, Station a at Holden, for Axis reading "86 ''.05 , " read 80.05. 



" 145, line 2 from top, for " subcarniferous," read subcarboniferotis. 



" 151, " 9 " bottom, for "9a)," read 9^). 



" 172, " 7 " top, for "y^ " (in part of edition), read -f^. 



" 178, "17 " " " '■'■ keteroyhylla," read heteoro-^hylla. 



" 181, "10 " •' " '■'■ lophoserma" lophosferma. 



