I SO K. R. BENSLEY. 



In his later studies Golgi confirmed this result for other types 

 of nerve cells including spinal ganglion cells, spinal cord cells 

 and cells of the cerebral cortex. In some of these cases he found 

 the network provided with freely ending branches which ter- 

 minated in a small swelling. In some cases, too, the fibers of 

 which the network was composed had varicose swellings on 

 them, and nodal enlargements, and, in some cells, he even found 

 two concentric nets which differed inter se by the amplitude of 

 the meshes and the size of the fibers. Golgi in all of his papers 

 expressed himself with great reserve as to the nature of the net- 

 work, but was confident that they had nothing to do with the 

 neurofibrils and that they were not canals which had been filled 

 with the silver precipitate. He was moreover certain that they 

 were entirely intracellular and that they had no communication 

 with extracellular structures. 



In the meantime Golgi himself and his students had been ex- 

 tending the field of investigation to other than nervous tissues, 

 and it had developed from these investigations that the retic- 

 ular apparatus was not confined by any means to nerve cells 

 but was present in a large variety of cells from different sources. 

 For example, Negri ('oo) demonstrated an apparatus of this 

 sort in the cells of the pancreas and of the parotid gland of the 

 cat, and in the thyroid epithelium of the dog. In these cells 

 the situation of the network was quite characteristic and recalled 

 the observations of Golgi that in young nerve cells with excen- 

 tric nucleus the reticular apparatus was also excentric and lo- 

 cated for the most part at one pole of the nucleus. In the epi- 

 thelial cells, namely, it was found that the reticular apparatus 

 was located near the nucleus, but between the latter and the 

 free border on the lumen or surface, that is, it was distal to the 

 blood vessels. Later, similar nets were found in the cells of the 

 epididymus by Negri, in cartilage cells by Pensa ('oi), and in 

 striated muscle fibers by Veratti ('02). 



The observations of Golgi were confirmed by a number of ob- 

 servers, using this method or one of the silver reduction methods 

 of Cajal. ketzius, for example, obtained good impregnations 

 of the apparatus in the nerve cells of the cat and rabbit, which 

 corresponded in their salient characters \\ith those <>l ('.<>l^i but 



