MICEOSCOPICAL EXAMINATION OF COMMON OBJECTS. 9 



3. Examine some mould (Peiricillium or Mucor) in water. Notice the long 

 branching filaments (hyphse), and also the torula-like particles (spores) from 

 which hyphae may in some instances be seen sprouting. Sketch part of a 

 hypha. 



4. Examine fibres of linen, and of cotton in water, using a high power. 

 Compare the well-defined, relatively coarse, striated, and slightly twisted 

 linen, with the longer, thinner, and more twisted cotton-fibres. Sketch one 

 of each kind. 



5. Mount two or three hairs from the head in water and look at them, 

 first with the low, then with the high power. Examine also some fibres 

 from any woollen material and compare them with the hairs. They have 

 the same structure, although the wool is finer and is curled ; its structure 

 may be partly obscured by the dye. Draw one or two woollen fibres. 



6. Examine some dust of the room in water with a high power. In 

 addition to numerous groups of black particles of carbon (soot) there will 

 probably be seen fibres of linen, cotton, or wool, and shed epithelium-cells 

 derived from the epidermis. 



