CANALICULAR APPARATUS OF ANIMAL CELL-. l8l 



were nt ne.irh so complete judging by the figures published. 

 In view of thi- it i> surprising to note that Retzius ('oo) found, 

 in -om- nf the cells, the fibers of the network communicai 

 by .t branch with the surface of the cell, which Golgi had never 

 oli-er\ed in hi- more perfect preparations. 



In a recent publication Golgi has adopted a new method for 

 the demon-iration of the reticulum \vhich is based on the -il\er 

 reduction method of Cajal. In view of this fact it is proper to 

 mention hen- that < ajal ('07) has also studied the reticular ap- 

 liaratu- in the nerve cell, which he accepts, contrary to Golgi. 



a tubular a]i|iaratus to which he applies the name "Conduii- 

 de Golgi-Holmgren," thus accepting the interpretation of Holm- 

 gren that they are the same as the so-called juice canals describe*! 

 l>\ him. II' i- .ids the. appearances seen in his preparations 



lue i" the pn >f canals filled with a coagulable substance 



which ha- an at'finit\ lor colloidal silver. He also notes dit'ler- 



es in the I eha\iot ( if the apparatus in different animals, from 

 \\hich he- on. hull - that the contents of the canals in different 

 tell- i'iav ha\e ililtereiit chemical pro[KTties. 



I. ' line met In. 1 1- as those employed by Cajal, Sam li< / 

 ilemon-i rait il an c\t vrdingly interesting system in the striated 

 inn-tie tibet- of mammals and insects. In the former this sys- 

 tt in did not communicate with structures outside of the cell 

 but -eni free ending branches \\hich terminated just under the 

 -aivi.lrmma. In tin- insects, however, he made the surprising 

 nb-er\ ation thai the intercellular network was in continuity 

 \\ ith the irai In al -ystcm. 



I'lie -eciuitl line of progress in the study of the reticular ap- 

 paratu-. bi^an \\iih the discovery by Kopsch that it could be 

 -taineil b\ pn>lon^etl immersion of the tissues in a two per cent, 

 -olutiun of o-niic acid. In a short paper (Kopsch, '02) he de- 

 -> til .til hi- inethoil and contributed the results of his application 

 of it. Tin n -nit- obtained corresponded very closely to those 

 .. I i ,..l-i but \\,n- obtained \,'ith greater certainty. Like < ',ol-i 

 he wa- unable to find any communications between the apparatus 

 ami the Mirfacc ol the cell, although in addition to the osmic 

 acid met hot 1 he eni|)loycd the resorcin-fuch-iii method of Holm- 



II, to \\hich reft re .ice will be made later. 



