EXERCISE 13 (Continued) 



FIG. 25. Third Step Sprinkle the formalin solution on the oats and shovel the oats thoroughly in order to 

 be sure that all the oats are moistened. Work fast so that little of the f ormalin gas escapes in the air. 



FIG. 26. Fourth Step Shovel the oats in a pile so they can be easily covered. 



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