THE PRINOIPAL TISSUES. 



75 



To examine fibrous tissue it is only necessary to make thin longitudi- 

 nal slicps ( f tbe stems of woody plants— e.fir., Acer, Pirua, etc.— and to 

 beat for a minute or less in nitric acid and potassium chlorate. The 



Fig. 64. 



Pig. 65. 



Fig. 64. — Laticiferona tubes from ffwpAorSm. .4. moderately magnified; B. more 

 highly magnified, and Bhowing the bone-shaped or dumb-bell-shaped starch grains.— 

 After Sichs. 



Fig. 65. — Laticiferoud vessels of Scor-zonera hispanica. A, a transverse section of 

 the phlogm of the root ; B, the same more highly magnified. — After Sachs. 



fibres may now be separated under a dissectingf raicrosftope, or the 



cases at least, the fibres are not cell-derivatives, and the partitions the 

 Dersistent walls of the orieinal component cells. 



