122 



TISSUES IN GENERAL. 



in a direction mainly vertical to that of the fibers. Even a single 

 fiber can be seen to be composed of alternating light violet and 

 dark violet portions. (See Fig. 36.) 



FIG. 36. LONGITUDINAL SECTION FROM THE CORTICAL PORTION OF THE 

 HUMAN UMBILICAL CORD, INTENSELY STAINED WITH CHLORIDE OF 

 GOLD. [PUBLISHED IN 1873.] 



P, the plastids (protoplasmic bodies) with nuclei; 8, smaller spindle-shaped plastids, 

 composing the basis-substance; F, torn flbrilla, with an alternating light and dark stain. 

 Magnified 800 diameters. 



Numerous torn fibers originate from bipolar nucleated lumps, 

 and each fiber appears to be pierced by a dark violet reticulum. 



Tissue of Tendon. Similar features are found in the tendon. 

 On rubbing the silver stick over the tendon Achillis of a freshly 

 killed dog several years old, or of a grown rabbit, exposed to 

 daylight, the brown tinction will appear after a while. 



With lower powers we recognize in longitudinal sections of a 

 tendon-bundle numerous narrow, spindle-shaped light fields, 





