OTHER RHYTHMS OF THE ORGANISATION 71 



division, which, as we shall see, is a most delicate 

 proof of organic mechanics. 



With fig. 16 we can follow the different 



FIG. 16. 



Epithelial cells in course of karyokinetic division of the skin of the larvae of 

 the Pleuro of the Walti. 7, the mother star ; 8, the longitudinal 

 division (polar view) ; 9, metakinesis ; 10, fixed star ; 11, young ovary ; 

 12, segmentation of the protoplasm. 



phases. In 1, it is the period of rest ; in the 

 following 2, 3, 4, we notice that a kind of network 

 appears in the nucleus, and its meshes increase in 

 size, albeit in irregular form. In phase 5, the 

 meshes have assumed a uniform shape and calibre, 



