I 12 EISEN. [VOL. I. 



plast is attached to one of the ends. This process is the one 

 that takes place in the auxocytes. 



The next step is the formation of a confluent umbrella stage 

 or ring-like nucleus. The object of this form is to allow the 

 chromoplasts to change their place. When the nucleus is 

 reorganized in the spermatocyte the chromoplasts are found to 

 be situated not at the end of each chromosome, but at the angle 

 of the fork. This change of position could not take place except 

 through the medium of an umbrella-shaped nucleus. During 

 this stage the chromioles are also doubled. The nucleus now 

 passes through a stage of growth which is facilitated through 

 the large vacuole which is formed around the nucleus with the 

 aid of the fiber cones and the accessory archosomes. 



In the spermatocyte the central spindle is frequently formed 

 from two opposite fiber cones left over from the last mitosis. 

 The chromosomes of the spermatocytes are F-shaped before 

 mitosis. They are divided longitudinally in the way usual in 

 the homotypic mitosis, and by equation, not by reduction. 

 During the prophases of the radiosomic mitosis the superflu- 

 ous archosomes are expelled from the cell and remain for some 

 time as paracellular bodies between the cells. 



PERMANENCY AND NATURE OF THE CELL STRUCTURES. 



The cytosome proper contains no permanent structures of 

 any kind. The plasmosphere, hyalosphere, granosphere, the 

 various kinds of fibers, as well as the central spindle, are all 

 ephemeral structures which are developed by rearrangement 

 of preexisting granula, and which again disperse when their 

 function is over. The granula contained in the cytosome is at 

 least of four different kinds, and everything points to the con- 

 clusion that one kind of granula is never converted into any 

 other kind. In other words, the granula of the granosphere is 

 not evolved from the granula of the plasmosphere, etc., but 

 both are independent and individualized primary structures as 

 compared with the secondary ones of spheres and fibers. For 

 the principal granula of the cell the following terminology is 

 proposed : cytosomes, plasmosomes, hyalosomes, somosomes, 

 granosomes, and linosomes, the latter being of nuclear origin. 



