/ THE CELL DOCTRINE. 71 



cell with another, aud 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 



Fio. 16. 





Coiinective tissue fronl the embryo of a pig after long-continued boiling. 

 Large spindle-shaped cells, connective tissue corpuscles (Bindegewebeskorper- 

 chen), some isolated and some still imbedded in their basis substance, and anas- 

 tomosing one with the other. Large nuclei with their membrane detached; 

 cell contents in some cases shrunken. X350. (From Virchow.) 



this system he also considers the cordlike fibres of 

 yellow elastic tissue as forming a part.f These he 

 considers, with Donders,:}: as originating by a traus- 



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



•|- Virchow, op. citat., p. 133, a. f. 



J Donders, Siebold und KolUker's Zeitschrift, Bd. iii. 



