per) Botany. 153 
the work has gone forward, retarded greatly by the death of Professor 
Eaton in 1895, whose son then undertook to bring it to completion. It 
is now issued under the title “ Sphagna Boreali-Americana Exsiccata,” 
and includes 172 numbers representing 39 species, distributed as fol- 
lows: 
I. ACUTIFOLIA.—S. girgensohnii Russ., S. fimbriatum Wils., S. rus- 
sowii Warnst., S. warnstorfii Russ., 8. tenellum (Schimp) Warnst. 
S. fuscum (Schimp) Klinggr., S. quinquefarium (Braithw.) 
Warnst., S. acutifolium (Ehrh., e. p.) Russ. and Warnst., 8. sub- 
nitens Russ. and Warnst., S. tenerum (Aust.) Warnst., S. molle 
Sulliv. (62 specimens, representing many varieties). 
II. Squarrosa.—S. teres Angstr., S. squamosum Pers. (10 specimens 
and several varieties). 
HI. Poryetapa.—S. wulfianum Girg. (3 specimens including two 
varieties). 
IV. Cusprpata—S. macrophyllum Bernh., S. floridanum (Aust.) 
Card., S. lindbergii Schimp., S. riparium Angstr., 8. cuspidatum 
(Ehrh.) Russ, and Warnst., S. dusenii (C. Jens) Russ. and 
Warnst., S. recurvum (Beauv.) Russ. and Warnst., S. fitzgeraldi ~ 
Renauld, S. molluscum Bruch. (39 specimens, including many 
varieties). 
V. Rietpa.—S. compactum DC., S. garberi Lesq. and James. (8 
specimens, including several varieties). 
VI. Sussecunpa.—S. pylaesii Brid., S. obesum Wils., S. subsecundum 
Nees, S. platyphyllun Warnst., S. contortum Schultz, S. rufescens 
Bryol. Germ., S. orlandense Warnst., S. microcarpum Warnst. 
(26 specimens, including many varieties). . 
VIL. Cymprror1a—S. portoricense Hampe, 8. imbricatum (Hornsch.) 
Russ., 9. eymbifoliam Ehrh., S. papillosum Lindb., 8. medium 
Limpr., S. ludovictanum (Ren. and Card.) Warnst. (24 speci- 
mens, including many varieties). ‘ 
A personal examination of this set shows it to be in every way satis- 
factory, the specimens being ample and prepared with exquisite neat- 
ness.—CHARLES E. Bessey. 
The Cell Nucleus.—The latest contribution to our knowledge of 
the plant cell nucleus is from the hands of Dr. Zim mermann of the Uni- 
versity of Berlin. His “ Morphologie und Physiologie des pflanzlichen 
Zellkernes” is destined to be one of the most useful of books, for in “e 
he has brought together what has been made out as to the nucleus 7E 
structurally and physiologically, for all groups of plants. In the first 
