DEMONSTRATIONS OR LABORATORY EXERCISES 



The following directions are made on the supposition that no teacher 

 will be giving instruction in Physiology who has not had specific prepara- 

 tion for it, and will therefore be able to comprehend the significance of 

 each suggestion, and know, in a general way at least, how to proceed with it. 



A list of firms, from whom many materials called for can be obtained, is 

 here given, as also formulae for the making of necessary gases and reagents, 

 and a table of equivalents between the English- American units of measure 

 and those of the metric system. By anticipating the class or laboratory 

 in a reasonable manner no difficulty will be found in making nearly every 

 page of the text vivid and scientific in its presentation. 



The chapter and page numbers refer to the relevant chapter and page 

 in the body of the text. 



CHAPTER I 



Page 12. Numerous forms of protozoa can be easily obtained from 

 dishes containing decaying pond plants, barely covered with water, which 

 have been standing quietly a couple of weeks, and may be studied by 

 placing them in a drop of water under a microscope. 



Page 15. Cells are easily shown by use of prepared slides. (See sources 

 of material and apparatus, page 421.) 



Fresh cells can be shown under a microscope as follows : in very thin 

 cross sections of plant stem, e.g. corn stalk, lily ; blood cells from frog, 

 or in blood from finger prick ; in thin bit of cartilage from upper end of 

 femur bone of frog ; in the thin tail of tadpole of frog, toad, or salamander. 



Page 17. Living protoplasm can be -seen easily in live Amoebae, gen- 

 erally found in dishes of decaying pond plants ; in cells of pond weed 

 Nitella, or Chara ; or in hair cells from leaf of Tradescantia (" Wandering 

 Jew ") ; high powers of microscope required. 



Page 23. Set aside (1) pond scum and weeds in dish with just enough 

 water to cover, for 2 weeks ; (2) hay in water (preferably in water in 

 which other hay has been boiled, and then cooled). 



Many unicellular animals will be found in a drop of this material under 

 microscope. See also addresses of firms who sell this material. 



399 



