Injury, recovery, and death, in relation to conductivity and permeability . s of various a looconcentrations. It would be possible to Fig. 51.—curves showing growth in mii- T tj* tures of unequally toxic solutions: the or- determine this additive curve dinateB express growth; the abscissfie express the composition of the mixtures as in Fig. 49; experimentally, and then to t\« dotted line Fry expresses the growth ^ ^ which would occur if there were no antago- ovr\roeo Qiif«o-nniGTYl nnmifi- ^^^ (additive effect); TLTr, antagonismexpiebb dllldgOIliSIU quaiUi ^^^^^. yg^r^ p^rve expressing increas
Injury, recovery, and death, in relation to conductivity and permeability . s of various a looconcentrations. It would be possible to Fig. 51.—curves showing growth in mii- T tj* tures of unequally toxic solutions: the or- determine this additive curve dinateB express growth; the abscissfie express the composition of the mixtures as in Fig. 49; experimentally, and then to t\« dotted line Fry expresses the growth ^ ^ which would occur if there were no antago- ovr\roeo Qiif«o-nniGTYl nnmifi- ^^^ (additive effect); TLTr, antagonismexpiebb dllldgOIliSIU quaiUi ^^^^^. yg^r^ p^rve expressing increased fnflVplv fnr PVanrnlp at fhP ^o^^ty (opposite of antagonism); theiaiivt; , xux t^Aaixipic, ctt lxic quantitative expression of antagonism at the point P it would be expressed °* as UT -T- TP. But the labor would be much greater thanby the method of mixing equally toxic solutions. Theadditive curve would be determined by growing plants,not in mixtures of A with B, but in mixtures of A withanother solution of A having the same toxicity as B. Or ^Magowan (1908).9. 130 INJUEY, EECOVERY, AND DEATH we might use mixtures of B with another solution of Bha\dng the same toxicity as A. The two methods mightnot give exactly the same result. This is an additionalargument in favor of using equally toxic solutions. An illustration of this method is found in the resultsgiven in Table VIII. The growth in the various mixtures(additive and antagonistic) was in part determineddirectly and in part was calculated from results obtainedby growing plants in mixtures having almost the TABLE VIII MIXTURES OP UNEQUALLY TOXIC SOLUTIONS Wheat (growth during 30 days) (NaCI Af+CaClz ) Culture solution CaCl275 per255050 2575 15 85 5 95 199NaCl cent, CaChNaCl , CaCl2,NaCl . . . . . Aggregate length ofroots per plant 85125 195 310 380 438 300 55 Additive effect 8575 60 58 56 5555 Antagonism 125-7575 310-60 60380-58 58438-56 56300-
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