THE CELL DOCTRINE. 



65 



canals or tubes, produced by the anastomosis of one 

 cell with another, and which he considers must be 

 classed with the great canalicular system of the body, 

 as forming a supplement to the blood and lymphatic 

 vessels, and as filling up the vacancy left by the old 

 vasa serosa which do not exist.* (See Fig. 16.) Of 



FIG. 16. 





Fig. 16. Connective tissue from the embryo of a pig after long-contin- 

 ued boiling. Large spindle-shaped cells, connective tissue corpuscles 

 (Bindegewebeskb'rperchen), some isolated and some still imbedded in their 

 basis substance, and anastomosing one with the other. Large nuclei with 

 their membrane detached ; cell contents in some cases shrunken, x.350. 

 (From Virchow.) 



this system he also considers the cord-like fibres of 

 yellow elastic tissue as forming a part.f These he 

 considers, with Donders,{ as originating by a trans- 



* Virchow, op. citat., p. 76. 

 j- Virchow, op. citat., p. 133, a. f. 

 J Bonders, Siebold und Kolliker's Zeitschrift, Bd. iii. 

 6* 



