Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
354
fair degree of probability two optimal points with, in the first
approximation, the same dry-weight. This very striking result
cannot very well be explained except on the assumption that the
nutritive and antagonistic functions of the salts co-operate. Because,
if the curve were due to the nutritive effect alone, it does not at
all agree with previous nutritive curves, and besides it does not
agree wilh the nutritive curve of the second experiment, which is
plotted in figure 6. On the other hand, it does not seem probable
that the nutritive effect should not influence the production in so
dilute a solution. In any case in concentrated solutions, according
to previous investigations, an antagonism curve shows only one
optimum, a feature which seems to the author to be essential for
the whole phenomenon of antagonism, if acting alone. He ventures
therefore to state that the experimental results do
support the hypothesis of a co-operation between
the two factors. This being so, in the second experiment we
must expect a curve essentially different from the above-discussed
average curve. And this is in fact the case. The curves deviate
from each other especially in the point VI (Ca: Na = 10:90 of the first,
Ca=90 of the second). It is very interesting to note that this
optimal point — for comparison calculated in molecular proportions:
6.1: 93.9 — is nearly the same as the optimal points of the pure
antagonism curves in concentrated solutions as found by different
investigators (see e. g. OsreRHovT 1922, [19] p. 127 and 130, where
Ihe optimal molecular proportions are 95:5). We have not made
any statement concerning the way in which these two aclions
combine, but if itis true that the average curve of the first experiment
represents the co-operation of two factors, the effect of one of them
being given in the curve of the second experiment, it seems sale
to state that the other factor must have an optimal point in
Ca: Na = 90: 10. Further the effect of this factor cannot be great
in the points Ca: Na — 80:20, and 50:50. —
The whole of the above discussion is based on the assumption
that the nutritive effect of sodium may be disregarded. Even if
this assumption should not be true, it seems quite improbable to
the author that the differences betwen the curves of the first and
second experiments could be explained by this effect alone, except
on the assumption that an antagonistic effect combines with the
nutritive effects of the two salts. It thus seems that even if sodium
can partly (and probably to a very small extent) replace calcium
<< prev. page << föreg. sida << >> nästa sida >> next page >>
