«€ 
NATURALISTIC PERIODICAL LITERATURE OF AMERICA 79 
are emphasizing this unity, and rightly so. If these same periodicals 
would bring the works of great naturalists more prominently into 
their fields of work and activity, America would have a naturalistic 
periodical literature of which she might well, indeed, be proud. 
CHRONOLOGY OF APPEARANCE OF PERIODICALS 
Sie ©) OLO PAS ere eee ae eee ee ee eee ee es Hyde Park, Mass. 
Toys VO UM ea O Glos tsi sia re 8 oe een eee eer de Gaines, N. Y. 
TS SA Sei tt hte es ak Pong ye SSN ele gis Oe Stet red aie fe Cambridge, Mass. 
TS Gee WALLS OMNES tA LM a IG sate lee a Oberlin, Ohio 
TES ChE?) iO) SIREN ee ik cere Me ee ce erie EOC Se cose Mecca yee Washington. 
RSG 7 EIA Sy ANT s NeUb tek eee ee Pee lek he IE Mag Bes et center Chicago, IIl. 
Ito's igs ed Fee Sav," (Covg Ke Bae eae sea a oe | Se Moab Ue Ae aren, Sha Washington, D. C. 
Hee LOLS a Bi Beto LS) (oy oh eee ele le ops SO ae EAL OD eae oe Coes eg Set PSE Be aS Penn. 
SO Ga COM GOR eee ne Re en eh ae oe eer ne Hollywood, Cal. 
NGO —— AM eh Can DOtATIS tes =~ ae ea fa ld ee een ees vee oe New York 
LOGOS SIN AtiITOUSCUG yin REVI Wrote ce 2 eee New York. 
ENOS——Gilidegtow Natunes 28 ais Boe AS ee es et hel Pea ae Conn. 
TOOO—— Ain Witdland: sNiaeiiicallis tess eee eee eee Notre Dame, Ind. 
rox4— Califor Naturalist, Club Annuals = 222 to eee Charles City, Ia. 
TOY) (7a BY HW Same) BU a ee MR NONUE ate Up BLN TAR ARGUS Fi erp Cleveland, Ohio 
NOS — ONC TA ETO Pere eee ASE! Rees Pie poe EO eel Sie ee 2 Philadelphia, Pa. 
TOLO— Audubony Bulletine +. 12 3m ee ee See he Chicago, IIl. 
1907 lowa, Consenvationi:-~ fet PO ee Iowa City, Ia. 
Plants of Fargo, North Dakota, With Dates of Flowering. 
Errata—Omitted between Ranunculus pennsylvanicus and 
Tilia—March 1921—p. 57. 2 
Sisymbrium officinale (1,.) Scop. HEDGE MUSTARD. 
Streets. Occasional. 
Sisymbrium altissimum \,. TUMBLING MUSTARD. 
Roadsides and fields. Common. June ro (11). 
Sophia sophia (1,.) Britton. FLIX WEED. 
Along railroad. Occasional. June ro. 
' Sophia incisa (Engelm.) Greene. TANSY MUSTARD. 
Fields and roadsides. Common. May 30 (29). 
Sophia hartwegiana Fourn. - HARTWEG’S TANSY, MUSTARD. 
Dry roadside. Frequent. June 25. 
Erysimum chieranthoides \. WORM-SEED MUSTARD. 
Common in woods and thickets; less so in open places. Ap- 
parently only one flowering record (June 20) besides an extremely 
-early one of Apr. 10, 1910. 
