28 THE CBIili DOCTRINE. 



The error of these and other observers seems to 

 have been clearly pointed out by Dr. Hodgkin,* 

 though much importance was stHI attached to the 



Fig. 1. 



Illustrating the Globular Theory. 



A, Fibre, composed of elementary granules (molecular granules), drawn up in 

 a line. B, Cell, with spherically arranged granules. (After Virchow, slightly 

 modified.) 



globule as an element of organization (but perhaps 

 from this time forward, more in the stricter sense of 

 the term granule), which has continued, in this latter 

 sense, to the present day. 



It should be mentioned that in 1828 Dollingerf 

 announced that the tissues of the body are built up 

 of blood-corpuscles, which move in wall-less (wandlos) 

 channels in these tissues. 



From the foregoing facts it is evident that for 

 some time prior to the year 1838, the cell had come 

 to be quite universally recognized as a constantly re- 

 curring element in vegetable and animal tissues, 

 though as yet little importance had been attached to 

 it as an element of organization, nor had its charac- 

 ters been clearly determined. As stages in its grow-,- 

 ing importance may be mentioned, the demonstration 

 of the cellular structure of plants by Robert Hooke, 



* Hodgkin, loo. citat. 



t DoUinger, Ignaz, Vom Kreislaufe des Blutes, 1828. 



