1898] CENTROSOMES IN PLANTS 163 
crescent-shaped, and sometimes twisted upon itself in the form 
ofan$. The length of the crescent often equals half the cir- 
cumference of the cell. This singular elongation appears to 
depend upon polar bodies which always occur at the points of 
the spindle. During the process sometimes these bodies are 
tepresented by a sphere with one or more granules, and some- 
times the sphere does not appear stained as the rest, a difference 
which may be attributed, in part, to the variable action of the 
feagents. In every case these bodies certainly represent centro- 
somes, Striations are also often to be seen extending from 
them into the cytoplasm. 
Often, also, the ends of the spindle are extended into a slen- 
der point, formed by several granules disposed ina line. One 
gn think that in this case there is no centrosome at the pole, 
Ps . my judgment, it is to be explained by the dissociation of 
& Primitive centrosomes, whose numerous granules have dis- 
as themselves in this way. The reaction of these elements 
nn certainly suggests this view. 
mo _ are found in all the phases of nuclear Give 
lectins 1 “al formation of the daughter nuclei they can still 
Deari € seen, becoming indistinct but not actually disap- 
"§- They are found during the second division of the 
Mother cell, 
oo avaieus is not lateral, but occupies a central 
Brains. The € cell, which is completely filled with starch 
character 3 mien presents an alveolar appearance. The 
in being of th € nuclear division differs from that in Nympheza 
chromosomes © normal type. It is to be remarked that the 
Mclear Plate ay core ai number, their arrangement in aii 
in the ferns, a being in groups of four, observed by Calkins 
animals. Ae “ a ad, zoologists in the copepods and other 
*€ also found € beginning of the prophases multipolar spindles 
Ta more or nee a extremities there is very on a granule 
Ure for ae distinct sphere serving as the point of depart 
3 lc threads. At later stages the polar bodies or 
“Ctros, i 
mes resemble those of Nymphea, but the bipolar spin- 
