“ 
376 
1 Flora Peoriana; The Vegetation in the Climate of Middle Illinois; Illinois 
Agricultural Society, Vol. III. 
* The Cayuga Flora. 
2a Guide to the Flora of Washington and Vicinity. 
$ Bulletin Torrey Botanical Club, Vol. vi. p. 211-213; 235-237- 
4 First and Second Annual Report Wisconsin Agricultural Experiment Station, 
1883, p. 56; 1884, p. 59. 2 
5 Annual Report of the Board of Regents of the University of Wisconsin for 
A 
2 
6 Bulletin Iowa Agricultural College, Department of Botany, 1886, p. 44- 
7 Thermische Constanten fiir die Blithe und Fruchtreife von 889 Pflanzenarten, 
aus d. K. K, Akad. d. Wissenschaften, Vienna, 1861; Sitzung 28 November, pp. 
120, t plate, Vienna, 1863. 
8 Sur le Climat de la Belgique, chap. iv. 
® Die Entwickelung der Vegetation durch die Warme u. s. w. Jahresb. (33 4. 
schlesischen Gesellsch. f. vaterlindische Cultur in Breslau (1855). 
10 Beitrage zur Phinologie. Giessen, 1884, 178 pp. (Hoffmann and Ihne), Pt. I, 
E. Ihne; Pt. IJ, H. Hoffmann. 
11 Ueber den phenologischen Werth von Blattfall und Blattverfarbung, Allg. 
Forst u. Jagdzeitung, 1888, No. 8; April, 1889, etc. ; 
12 Bulletin Iowa Agricultural College, 1886, p. 44. 
I.—SUCCESSION OF FLOWERS FOR 1886 AND 1891. 
NAME, 1886. 1891. 
eet eee 
Acer nigram. <2... Se Pea) Oo aks Ae April 30. vaeeee 
Acer saccharinum «1. 6.0.27. «++ Coe March 22, April 7 
Amelanchier Canadensis............2...00- April 20, a a 
Anemone nemorosa...........00eeeeeecees +e 180, ‘* 26, 
Antennaria plantaginifolia................. re AO ‘* 26. 
Capeella Bursa-pastoris,... 0.50.6. 6 icine oo ee, ie 
Claytonia Virginica............ Doe eect or ees ee e 9 ae 
TIMICOTIN IRCININTE ns Sock ea os cece April 20, ‘26. 
Diewstrs Cucullatla. cess. ies rice ois ee oes 
OPAON KR OOUMIAIG 5 5 i oe sok tse et ee “23. 
Erythronium albidum..............-..3.0. +. Or. HS 
Geranium -maculatum.. 2.0.52 .0t55hs cigs vee May 4, May 22. 
Henatica scuttloba.; .. 650555005. ae April 9, April 12 
Hydrophyllum Virginicum.... .... 2... ay 16, May 14. 
Hypoxis recta? 6.6065. - 5 me eerue ay April 25, hes Ae 
Lithospermum canescens.......... oo. ee May 1, ad 
Mertensia Vitginicas:¢ i. .c. ss shu es April 20, April 28. 
Negundo aceroides ¢ 5. ¢5 yc. 549 Pees Ve 16 as 
Oxalis corniculata (5.5). Si. 0 snes We es a a May 23. 
Oxalis violaceass 35. (igus eae age April 23 eats... 
Pastinaca sativa -6.2-.i9,0) ee May 29, Wea. 
Phlox pilosa. ss oissss7scin Brea iia na 
Podophyllum peltatum........... Rta ees > May 7 ae 
Populus monilifera :. 2.4. /icneee tee ee April 18, April 20. 
Pranus Pennsylvanica,.........s5 tens. May 10, oe 
Pyrus coronaria. 6. cscs csea os cue eeeeee ee May 13. 
Ribes aurewiti... .. 4.305 a Rea ges Py pees April 28. 
Ulmus Americana .....6 00.0000: Pe ssn AED April 13. eee: 
Ulmus fulva: sae. ae “ 23, we | ah 
Viola palmata, var. cucullata............... “43, a 
Viola pubescens...... bickeae els epi Sees vas 
