PLATE 4 



EXPLANATION OF FIGURES 



47 Sketcli of section to show two fragments of the nucleus, a retort-shaped 

 vesicular body containing masses of chromatin which ai)pear to be in process 

 of division; and the peripheral vacuoles. X 415. 



48 The retort-shaped body shown in figure 47, greatly magnified. X 1673. 



49 Sketch of total i)reparation showing an extended nucleus following the 

 circumference of the cell. X 415. 



50 Total ijreparation to show the loosely coiled nucleus in the center of the 

 cell. X 415. 



51 Sketch of a section showing an almost straight nucleus. X 415. 



52 Sketch of a total preparation in which the nucleus is seen tightly twisted. 

 X 415. 



53 A portion of the nucleus pictured in figui'e 65, showing elongated chro- 

 matin granules. X 787. 



54 Karly division stage drawn from a total preparation to show elongated 

 nucleus and three vesicular bodies. X 415. 



56, 57, 58, 59, Gl A series of division stages drawn from the living animal. 



60 Total prei)aration of a late division stage to show the elongated nuclei 

 and two vesicular bodies. X 415. 



62, 63, ()4, 65 Serial sections of a dividing (•(^11. showing comma-shaixMi and 

 1 lirc.'iil-likc bodies scattcu'ed t hroughoul t lie ciidoiilasin. A section of I he luicleus 

 is shown ill figures (14 and ()5. X 415. 



406 



