Guilllermond - Atkinson 



— 192 — 



Cytoplasm 



moreover, that the images obtained by osmic acid correspond 

 always to those produced by silver methods and there has been no 

 proof whatever that the dictyosomes can really be homologized 

 with the Golgi network. One can not, therefore, suppress the 

 thought that under this name have been grouped very diverse 

 formations. One is forced to admit that there is reason to distin- 



FiG. 129. — Barley root. 1, meristem vitally stained with neutral red; vacuolar 

 system deeply stained, more or less reticulate. 2-11 Bensley's method; 2-9, meristem; 

 vacuolar system has the appearance of Holmgren's apparatus. 10, 11, differentiating 

 cells; Holmgren's apparatus transformed into large vacuoles. 



guish between formations which are perhaps entirely different: 

 the Golgi network of Golgi and Cajal obtained by means of silver 

 methods and the dictyosomes later brought out by osmic methods. 

 Holmgren, on the other hand, by the use of special methods, 

 described in certain animal cells a network of hyalin and colorless 

 canaliculi appearing as clearly as if punched out of the dense and 

 stained cytoplasm. This apparatus, called the canaliculi of Holm- 

 gren or fluid canaliculi or trophospongium, has been found in a 

 great number of animal cells. Holmgren at first considered it as 



