Dates of Publication 
No. 1, for January. Pages 1-50. Issued February 10, 1910. 
No. 2, for February. 51-96. March 5, 1910. 
No. 3, for March. 97-162. March 31, 1910. 
No. 4, for April. 163-214. April 29, 1910. 
No. 5, for May. 215-272. June 2, 1910. 
No. 6, for June. 273-344. July 21, 1910 
No. 7, for July. 345-392. July 29, 1910. 
No. 8, for August. 393-442. September 8, 1910. 
No. 9, for September. 443-486. October 5, 1910. 
No. 10, for October. 487-522. October 28, Ig10. 
No. 11, for November. 523-568. November 30, 1910. 
No. 12, for December. 569-630. January I1, 1911. 
Errata 
Page 31, line 5, for occidentalis, read occidentale. 
Page 112, line 3 from bottom, for identity, read identify. 
Page 114, line 13 from bottom (second column), after MAGNOLIA GRANDIFLORA, 
add (H) 
Page 114, line 10 from bottom (first column), after Morus rubra add (h). 
Page 115, line 14 from bottom (second column), for Cardiospermum Hali- 
cacabum, read Cardiospermum Halicacabum. 
Page 122, line 2 from bottom, for Buff, read Bluff. 
Page 196, line 20, for Geinitzti, read Geinitz#. 
Page 199, line 14, for Heeri, read Heerit. 
Page 220, line 9 from bottom, for Donnell1, read Donnellit. 
Page 251, line 10, for was, read were. 
Page 385, line 4 from bottom, for Not all species, read None of the specimens. 
Page 385, line 3 from bottom, for belong, read belongs, and for for, read 
although. 
Page 447, lines 10 and 11 from bottom, for Macounii, read Macount. 
Page 556, line 4 from bottom, for Flodmannit, read Flodmanit. 
Page 557, line 16, for brevifolius, read brevifolrum. 
Page 559, line 2 from bottom, for Schuykill, read Schuylkill. 
