374 The American Naturalist. [ April, 
rule. No individual or unique paging is to be cited under any 
circumstances. 
g. Figures, plates and exsiccatz are to be printed in Italic 
Arabic numerals, the number designating the figure or plate to 
be preceded by the abbreviations f. and l., respectively, in Ital- 
ics. d. following a page number may be used, when desired, to 
ree description of a species. 
. Exact date must be given if possible, written in the mode 
ae with the abbreviations for months used by Library Bureau.* 
bles year at least must be given. 
. Punctuation. Except the comma following the author’s 
name, and the colon following the volume number all the items 
are to be separated by periods. If another citation follows in the 
same line it is to be separated from the first by an en dash. Spe- 
cific, generic and varietal names are to be written and punctuated 
in the method used in the ‘‘List of Pteridophyta and Spermato- 
phyta’’ issued under the direction of the Botanical Club, A. A. 
n- 
j. If it is considered desirable to give other data than series 
number (if any), volume number, page and date, these should 
be added in brackets after the date. But useless or unnecessary 
data should be avoided. 
k. Citations of reviews, abstracts, and all such secondary refer- 
ences should be enclosed in parentheses. 
Examples. 
I. Lagerheim, G. von. Ueber das Vorkommen von Eu- 
ropæischen Uredineen auf der Hochebene von Quito. 
Bot. Centralb. 54: 324-331. 1893. 
2. Trelease, W. A revision of the American species of 
Epilobium occurring north of Mexico. Rept: Mo. Bot. 
Gard. 2: 69-117. pl. I-48. 22 Ap18ọ91. 
a Sargent, C. S., Editor. Populus monticola. Gard. 
and For. 7:313. f. 56. 8Ag1894. 
*Those abbreviations are as follows: Ja, F, Mr, Ap, My, J>, Jl, Ag, S,O. N, 
; i.e, the initial of the month followed by the first distinctive letter. 
