98 Caroline McGill, Fibroglia Fibrils in the Intestinal Wall of Necturus etc. 



Fig. 4. A cross-section of the basement membrane and a portion of the sub- 

 epithelial tissue from the intestine of Necturus. Fixation, Zenkers fluid; 

 stain, Heidenhain's iron-haematoxylin eosin; magnification, 1400. The 

 haematoxylin was not far extracted so that all the fibroglia fibrils, both 

 coarse and fine, are stained black. In this section the fibroglia fibrils 

 occur in a syncytium formed by the anastomoses of the branches from 

 the stellate cells. The fibrils run in every direction forming a distinct 

 network. be = base of the epithelium; b = basement membrane; 

 cc = stellate cell of the syncytium; g = granular protoplasm; cf = coarse 

 fibroglia fibril; //" = fine fibroglia fibril; bf = coarse fibril breaking up 

 into a brush of fine fibrils ; rvf = collagenous fibrils. 



Fig. 5. A portion of the subepithelial tissue of the intestine of Necturus. Fixation, 

 Zenkers fluid; stain, Mallory's anilin-blue connective tissue stain; magni- 

 fication, 1400. The intestine had been contracted by electrical stimulation 

 and fixed while still contracted. The wavy course of the collagenous fibrils 

 and the comparatively straight course of the fibroglia fibrils is apparent. 

 a = a bundle of fine and coarse fibrils which, outside the section drawn, 

 was in relation to an elongated cell. Note the close resemblance to a 

 smooth muscle fiber, cf = coarse fibroglia fibril; cc = stellate cell; 

 ff = fine fibroglia fibril. 



Fig. 6. From the tunica propria in the center of a villus of the intestine of 

 Necturus. Fixation« Zenker's fluid; stain, the iron-haematoxylin method 

 of Heidenhain, counterstained with eosin; magnification, 1400. The stellate 

 cells unite to form a syncytium. In the granular protoplasm of this 

 syncytium are large numbers of fibroglia fibrils, both coarse and fine, cut, 

 in the main, in cross-section, cc = stellate cell of the syncytium; 

 s = syncytium; c/ = coarse fibroglia fibrils in both cross and longitudinal 

 section ; ff = fine fibroglia fibrils ; wf = collagenous fibrils. 



