WONDERS OF THE MICROSCOPE 261 



not due to the colouring pigment, but is owing 

 to the air contained in them. The colourin''- 



Fig. 181. Shavings from the hunuin beard 



matter is contained in the outer or cortical cell 



layer. 



Most animal hairs make interesting objects for 

 microscopic investigation, and by a little practice 

 sections of hairs may be cut with a sharp razor, 

 after tyine a little bundle together and dipping in 

 o-lue and allowing to dry, afterwards dissolving off 

 the olue. Hair sections sometmies are surpris- 



