Pa 
In case the flower has not been visited by a Megachile the Halictus goes — 
40 BOTANICAL GAZETTE. [ February, : 
to the moutk of the corolla and enters in the usual way; but it usually — 
alights on the base first and hunts for the artificial opening. a 
Mt. Carmel, Til. J. SCHENCK. & 
An acknowledgment. 
In the correcting of the proof of the paper on the ostrich fern, a . 
ticed in the Gazerre for December, a paragraph stating under what con- — 
ditions the investigations were made was inadvertently omitted. thie 
work was done under the supervision of Professor V. M. Spalding, © A 
University of Michigan, to whom the author begs to offer this panes ns 
tardy expression of his thanks for the valuable assistance and encourage- 
ment received from him during the pursuance of the work. 
Berlin, Germany. Dovetas H. CAMPBELL. 
CURRENT LITERATURE. 
Flowers and fruit of Sparganium and Typha.' 
In this. monograph Dr. Dietz has given the results of a comparative 
study of the development of the floral and fruit structures of ance 
: 0 
botanists can speak with any definiteness upon the relationships of plants; 
studies which should be greatly multiplied, and which furnish a vast and ‘ 
useful field of labor for our ever increasing army of botanists. Taking re E 
group of doubtful relationships, the author has laid the foundation for Ps : 
rational discussion of the subject, which he promises at some subsequent 
time. The vegetative structures are mostly alike, but the reproductive 
l a Dr, na Tone ae die Entwickelun I 4to. 
Tourn. un ypha fourn, (Bibliotheca botanica, heft 5.) 60 pp. 3 plates. ‘4 
sel: Theodor Fischer, 1887.—8 mark, A roe 
(po Tacs feaaues ol 
g der Bliithe und Frucht von Sparen 
