Homolofiue of tlie Golrji Ajjpa-ratus in Plccnts. 297 



their appearance. These consist of darkly staining oval and elon- 

 gated bodies, many clustered around the nuclei. They are most 

 easily demonstrated in the superficial cells (see figs. 3 and 4), and 

 in them they are almost entirely short, oval, flattened elements. 

 If the mordanting be pushed still further, the mitochondrial elements 

 no longer stain, whilst the Grolgi apparatus stains more intensely 

 and becomes evident in the great majority of the cells. In the 

 central cells, especially, it occurs as coarse and irregular filaments 

 and rods, many closely adherent to the nuclei (see fig. 2). (The 

 same effect of prolonged mordanting has been demonstrated in 

 animal cells, where again it is found that the shorter chromating 

 only brings out the mitochondria, whilst these stain more faintly 

 after longer mordanting and the GolgL apparatus appears).* From 

 their general appearance, their relation to the nucleus, and their 

 behaviour with chroni-osmic a(ud it is reasonable to class these 

 structures in plants with the Golgi apparatus of animal cells. This 

 is also suggested by their sensitiveness to external conditions, as 

 well as to the histological differentiation of the cells at the time of 

 fixation. During mitosis the Golgi apparatus is distributed l^etween 

 the two daughter-cells, but I have not been able to ascertain with 

 what degree of accuracy it is divided between the two. 



Eeferences. 



1. A. GuiLLiERMOND — C. E. Soc. Blol., Ixxxlli. (1920) pp. 408 and 411. 



2. A.-Ch. Hollande— C. R. Soc. Biol., Ixxix. (1920) p. 662. 



* The Cajal silver method is not successful with plant tissues, but sections 

 stained in this manner showed that the elongated bodies stained with the silver, 

 which is additional evidence as to their identity with the Golgi apparatus. 



