EFFECTS OF pH AND OF VARIOUS CONCENTRATIONS OF SODIUM, POTASSIUM, AND CALCIUM CHLORIDE ON MUSCULAR ACTIVITY OF THE ISOLATED CROP OF PERIPLANETA AMERICANA (ORTHOPTERA).

r) .................. Degreesoffreedom 239 144 1 1 3 2 i 1 3 3 2 2 6 1 1 3 2 63 Sum of squares 125.66 56.01 3.81 0.77 3.72 1.88 10.14 Meansquare 0.39 3.81" 0.77 1.24* 0.94~ 10.14" 3.34 7.93 2.01 4.11 2.91 3.38 3.55 1.70 1.32 1.47 17.61 3.34* 2.64* 0.67* 2.06* 1.46* 0.56 3.55* 1.7o~ 0.44 0.74 0.28 * Highly significant. :~Significant. a preliminary survey of data had indicated a possible difference between crop activity on the 1st and 2nd day of the solution's use, in spite of the fact that the pH was adjusted at the beginning of each day's run.

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