FORM OF GOLGI 95 



fatty yolk. Thus, in the vacuole-Uke elements free fat is deposited 

 until they apjiear as fatty yolk spheres. This deposition appa- 

 rently occurs in the chromophobic " area," as, after treatment in 

 turpentine, osmicated tissues show only the chromophilic portion 

 still black. On the other hand, he quotes several cases of apparent 

 direct metamorphosis of Golgi elements into fat as corroborative 

 evidence. As will be shown later, the whole conception of the 

 Golgi apparatus advocated by Parat is based on entirely erroneous 

 analogies, and most of the views of the Golgi apparatus which 

 assume a spherical form are more or less tainted with the 

 canalicular idea of Holmgren, to which Parat refers. 



The very well-known series of papers by Gatenby on the 

 spermatogenesis of many invertebrates (30a-i, 33, 35), and also 

 the work of Bowen on insect spermatogenesis, make it clear that 

 the rod is at least a very common form (Fig. 52, E, F), in which 

 the Golgi elements appear when fixed, and any theory assuming 

 another form, such as a vesicle, must attempt to give some 

 explanation of the rod form after fixation. In the protozoa, 

 Nassonov (91, 92) homologises with the Golgi apparatus of the 

 higher forms an osmiophilic cup or hemisphere which he has 

 described around the contractile vacuole of various ciliates. 

 Bowen (11) and Gatenby (35) are both inclined to accept Nassonov's 

 interpretation. 



It must further be remembered that in the spermatogenesis of 

 any given species the Golgi elements may be either diffuse or 

 collected and fused until they form a cup or almost closed vesicle 

 within which they secrete the acrosome (Fig. 56) (see also p. 140). 

 Furthermore, it is difficult to conceive of vesicles having any 

 formal relationship with the plate-like structures often fenestrated 

 and drawn out into networks, which are found in the vertebrates. 



Bowen (11) is inclined to dismiss the exact form as unimportant, 

 and to consider the Golgi apparatus rather in terms of substance 

 than form. This would permit the apparatus either to be scattered 

 throughout the cell in discrete bodies, or else to form definite 

 concentrations leading up to the hemisphere, plate or network. 



Another feature, not of constant occurrence, however, must 

 here be considered. This is the peculiarly modified cytoplasm 



