372 BULLETIN OF THE ' 



tially a repetition of those already given in another paper. Sec pp. 304, 

 305. In addition, he maintains (p. 22) in regard to the spindle that 

 two things have been confounded. A portion of the meridional lines are 

 only rows of dark granules imbedded in the cell protoplasm, which lie 

 at the surface of the spindle in the territory of the radial expanse of the 

 karyolytic figure. With the use of a low magnifying power, or after 

 employing hardening reagents, the yolk granules which are closely 

 packed in the intervals between the rays that stretch from pole to pole 

 (spindle) may have the appearance of continuous meridional lines. 



I do not believe the filaments of the spindle in Limax can be ac- 

 counted for in this way. There are no interfilamentous rows of proto- 

 plasmic granules in the territory of the spindle, but the spindle fibres 

 themselves are, if not in the beginning, eventually much thicker than 

 the extra-spindle rays. 



Auerbach, for the sake of brevity, would substitute " Karyolyma " for 

 " karyolytische Figur." 



Incidental to a criticism of TschistiakofF's use of "pronucleus" for the 

 physiological nucleus, which subsequently becomes a morphological nu- 

 cleus, he suggests that the at times apparently striate middle portion of 

 the karyolyma may better be called internucleus. This, however, seems 

 to rest on a misconception of, or refusal to recognize, the essential na- 

 ture of the nuclear disk and its separated halves. 



Among botanists, it is Strasburger ('76) to whom are due the most 

 extensive contributions in this line of research. 



Led, by the study of alcoholic preparations of embryos of the pine 

 family, to the conclusion that before cell division the nucleus undergoes 

 radical morphological changes, he successfully endeavored to control 

 his observations by the close study of some living object on which the 

 inferred metamorphoses might be followed step by step. He had come 

 to the conclusion, from the study of alcoholic specimens of successive 

 staojes, that the nucleus before cell division becomes elonsrated, more or 

 less ellipsoidal, and presents in its equator a peculiar plate composed of 

 a single layer of nearly parallel rodlike granules ; that, further, to both 

 sides of this plate bands (Streifen) are attached, which converge toward 

 the poles of the nucleus, thus lending to the latter a spindle-like appear- 

 ance ; that subsequently the plate of rods (Stabchenplatte) becomes 

 split into halves which, by mutually receding, approach the poles of the 

 nucleus, but leave stretched between them numerous fine Kernfiiden 

 [interzonal filaments]. The substance of the halves after migrating 

 toward the poles of the spindle forms two new nuclei, one for each of 



