UME XXX NUMBER 6 
CELLS OF OSMUNDA REGALIS. 
IBUTIONS FROM THE HULL BOTANICAL LABORATORY. 
R. WILSON SMITH. 
(WITH PLATE XXII} 
| HE cytology of the vascular cryptogams has received scant 
Muon at the hands of botanists, as a glance at the literature 
*eris, and Pteris. Osterhout’s (11) article on Equisetum 
lorable as the first complete account of the formation of a 
= uncontrolled by directive spheres or centrosomes. . He 
~ tat the appearance of the spindle was heralded by a felt- 
* of threads about the nucleus, and that the threads later 
€d themselves into a multipolar spindle, and afterwards 
ag characteristically bipolar. These three publications, 
ter with that by Shaw (12) on fertilization in Onoclea, and 
aa Belajeff (2, 3, 4) and Shaw (13) which treat of the 
Tinut 
: of the cilia of spermatozoids, make up almost the total of 
© esearch into the cytology of the pteridophytes since 
troduction of improved methods of technique. 
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