1893.] Open Letters. 279 
yz,” and is credited to the joint authorship of Dr. Robinson and Mr. 
H. E. Seaton. Thirty-four new species and varieties are described. 
Mr. J. Curistian Bay, of the Missouri Botanical Garden, has just 
published a bibliography of the tannoids, being issued in advance from 
the fifth annual report. Such publications are exceedingly useful, 
and become necessary for the preparation of monographs. It will be 
femembered that the same author has previously published a similar 
bibliography of inulin. 
A cick List of the plants contained in the sixth edition of Gray’s 
Manual has been compiled by John A. Allen and issued from the Her- 
barium of Harvard University. The species have serial numbers, 
including the varieties, and show a total of 3,781. An appendix at- 
tempts to enumerate the additional plants found within the limits of 
the manual since the issue of the sixth edition, bringing the total num- 
ber to 3,937. 
PROFESSOR A. S. Hircucock has published a Key to Kansas trees 
in their winter condition reprinted from the 8th biennial report of 
the Kansas State Board of Agriculture. 
OPEN LETTERS. 
With The bibliography of Amérien botany. 
hina a to a yearly bibliography and reference-work of Amer- 
points ical literature, I have been asked to submit the following 
; 2 {cllow-workers: 
serican botanical lit i i important réle 
i ou iterature is playing a very impo 
4 a k Therefore it will be a aa! necessary step to take to 
fa) A tat of similar to Just’s Jahresberichg which could furnish: 
ately com * gaa and works in every department of botany, aso 
DM hg of each of these papers and works, short and perfectly 
*~ Awo 
+ In order 
= 
