Bui. 365, U. S. Dept. of Agriculture. 



Plate XII. 



Fig. 1.— Case 610 at 11.49 a. m., July 13. Fig. 2.— Case 61 Oat 11.49'^ a. m., July 13. 



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^oi^r*- ^^ v^mml^* ''••^II^bB 



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Fig. 3.— Case 612 at 1.18 p. m., August 7. Fig. 4.— Case 612 at 1.30 p. m., August 7. 



Fig. 5.— Case 61 2 at 1 .37 p. m., August 7. Fig. 6.— Case 61 2 at 1 .47 p. m., August 7. 



