. Botanical gazette. Plants. 352 BOTANICAL GAZETTE APRIL amount of respiration are approximately double that of the normal, although the tissue is shown by the method of electrical resistance to be dead. This is brought out very strikingly in fig. i where we plot as ordinates the relative amount of respiration (curve C, table I A), relative rate of respiration (curve B, table I A), net resistance as percentage of that at the start (curve A, table I B) respectively (unbroken lines). When the relative rate of respira- tion has practically reached zero (curve B) the relative amount of °/4rest. RE
. Botanical gazette. Plants. 352 BOTANICAL GAZETTE APRIL amount of respiration are approximately double that of the normal, although the tissue is shown by the method of electrical resistance to be dead. This is brought out very strikingly in fig. i where we plot as ordinates the relative amount of respiration (curve C, table I A), relative rate of respiration (curve B, table I A), net resistance as percentage of that at the start (curve A, table I B) respectively (unbroken lines). When the relative rate of respira- tion has practically reached zero (curve B) the relative amount of °/4rest. REL. AMT. OF MINUTES Fig. I.—Curves showing effect produced by sea water, approximately saturated with ethyl bromide, upon relative amount and relative rate of respiration, and upon net electrical resistance of Laminaria: curve A, ordinates represent net resistance as percentage of that at start; curve B, ordinates represent relative rate of respiration; curve C, ordinates represent relative amount of respiration (unbroken lines); controls in sea water (broken lines); each control curve bears same symbol and letter (with a prime) as experimental curve; abscissae represent time in minutes. respiration is above unity. At the end of 60 minutes, when the tissue can be considered dead, the relative rate is seen to be about double that of the normal rate. Table II A shows the effect produced by sea water containing per cent (by volume) acetone, made up to the electrical conductivity of sea water by the addition of concentrated sea water, upon the relative amount and relative rate of respiration of Laminaria. At the end of hours the rate of respiration is still above the normal rate, while the relative amount of respira-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hanover, Ind.
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