I 10 RISEN. [VOL. I. 



plasts, and consists in the development and evolution of the 

 leaders out of chromoplasm and the chromioles, the formation 

 of the latter into chromomeres and chromosomes, and the mul- 

 tiplication of the chromioles and their proper distribution in 

 the chromosomes. The two processes cooperate in the separa- 

 tion and equation of the chromosomes, which cooperation com- 

 mences with the dissolution of the nuclear membrane. To the 

 chromosomic process belongs also the movement of the chro- 

 moplasts in the umbrella-shaped and confluent nucleus at the 

 end of the anaphase. With this process the archosomes have 



nothing to do, as it is accomplished before 

 the nuclear membrane is dissolved by the 



* 



mantle fibers. 



The radiosomic process commences with 

 the dispersion of the spheres. The plas- 



.. ' - : S./ >,- .* 



v y~ . ; ",.-" mosphere is dispersed first, and its granules 



...#'4 / are arranged in the equatorial of the cell, 



'-I-':;-^ 1 * ./' '" : 



there to furnish material for the new cell 

 FIG. i 5 . -A diagrammatic rep- wa lls. The central spindle fibers are then 



resentation of the structure of 



imosomes and the Hnopiast. formed out of material furnished by the 



The individual linin granules 



are connected by means of granosphere, which is in this way entirely 



Linopodia. The linoplast con- , ,-r-., , , . ,. 



tains linosomes as well as an used U P- The nuclear membrane is dis- 



endonucleolarbody. 



central spindle fibers. The contractile fibers are formed after 

 the central spindle fibers have reached considerable size. 



The chromosomic process begins with the formation of lead- 

 ers out of chromioles and chromoplasm. The chromioles aggre- 

 gate into chromomeres, and, later on, a certain number of these 

 form chromosomes. Their formation is shortly as follows : 

 The leaders to the number of twelve are connected with the 

 chromoplasts, and by contraction and a certain arrangement 

 assume the bouquet stage. The leaders then split lengthwise, 

 the two forks being held together by a fragment of the chro- 

 moplasts. The chromoplast divides into as many parts as there 

 are to be chromosomes, but each part is always attached to a 

 leader. Next, the two halves of the leader spread apart and 

 twist around each other and thus form a pretzel-shaped chro- 

 mosome. By this time the nuclear membrane is dissolved and 



