No. 454.] STUDIES ON THE PLANT CELL. 



739 



with the breaking down of this structure, llie fiber 

 into projecting cones presenting a multipolar structure, 

 of these, becoming more prominent, absorb the others : 

 form a bipolar spindle. 



One of the most recent studies on si)in(lle tonuation i: 

 Osterhout (: 02) on Agave. This investigation is ot 

 interest for the extensive experimentation in the teehi 

 fixation. The author proposes a new terminolog)- lor ih 



around the early stages of the spindle. The fil^rilla' ton 

 of this memhrane and finally push through it radially 

 exterior cytoplasm where they gather into cones (1-ig 

 The cones separate into two O])posite grou])s with a 

 parallel arrangement of the fibers and in this manner ;i 

 spindle is formed. 



It is becoming possible to make some general sta 

 respecting the methods of spindle tormation in th 

 mother-cell. Just previous to i)rophase it is ^almost 

 possible to differentiate a region of kino])lasm aroi 



Pellia, Anthoceros (Davis, '99 and :oi). Osmunda (Smit 

 Cobea and (dadiolus (Lawson. '98 and :oo), or it prese 

 appearance of a fibrous reticulum, l-:c|uisetum (Os 



'97), Larix (Allen, :03), I-iHum (^h.tt,er, '97 and '9 



partly by the e\] 

 growth and freq 



nulti[)olar spindle. By the 1 

 lewhat parallel to one an(jthe 



