EXERCISE 79 

 PREPARATION OF MOLD CULTURES 



Materials. Molds will grow on almost any organic material if it 

 is kept damp. Their spores reach substances in much the same 

 manner as do bacteria. In order to have on hand a variety of molds 

 for study, it is advisable to prepare a number of cultures. These 

 should be observed from day to day and the facts regarding the 

 growth of the molds recorded. * l" ! i \ / 



Directions for work. 1. Moisten a pisce pf .br^d ^wijjch; has 

 been exposed to the dust of the air. Cover wioL glass to pre- 

 vent evaporation while allowing observation. 



2. Put a piece of banana peel under a cover as in 1. 



3. Inclose a lemon or part of one in a similar manner. 



4. In a dish place various vegetable scraps and cover. 



5. Cover a dish of fruit and gelatin dessert, or similar 

 preparation. 



All of the preparations suggested above should be covered 

 with glass to allow observation without disturbing the mold or 

 exposing it to the air. It is usually convenient to place the 

 material in a small shallow dish and cover with an inverted 

 drinking-glass. The experiments should be placed in a warm 

 location. 



[101] 



