. Annals of applied biology. Biology, Economic; Biochemistry. F. KiDD AND C. West 231 (J) the initial 'capital,'' and (2) the " rate of interest^"' The first of these factors has a pre-determining effect upon the development of the plant and cannot be influenced by subsequent environmental conditions, but the second factor would naturally be under the influence to some extent of the environmental conditions obtaining during the main growth period of the plant. Curve a in Fig. 2 shows the change occurring from week to week in the "rate of interest" of the growth of normal pl
. Annals of applied biology. Biology, Economic; Biochemistry. F. KiDD AND C. West 231 (J) the initial 'capital,'' and (2) the " rate of interest^"' The first of these factors has a pre-determining effect upon the development of the plant and cannot be influenced by subsequent environmental conditions, but the second factor would naturally be under the influence to some extent of the environmental conditions obtaining during the main growth period of the plant. Curve a in Fig. 2 shows the change occurring from week to week in the "rate of interest" of the growth of normal plants. In this case the "rate of interest" or, in other words, the "efficiency " of the plant is at its maximum during the second week of growth and subsequently gradually falls throughout the course of later development^. T. "76^ WEEK Fig. 2. Change in the percentage increase in dry weight from week to week ( " rate of interest") in the case of a, normal plants of Helianthus annuus Bismarckianus; b, plants from which one cotyledon and one foliage leaf had been removed; c, plants from which both cotyledons had been removed. ^ The German authors used the expression "Substanzquotient," which is the dry weight of the plant at time n divided by the dry weight of the plant at the time n -1. The unit of time taken is arbitrary and is one week. It seems to us more suitable to use the expression "rate of ; The "rate of interest" = 100 (Substanzquotient - 1). * In the case of the data obtained by Gericke the question which immediately pre- sents itself is how far the fall in the "rate of interest" curve is due to inherent causes and how far it is due to the hmiting factors of the environment, hght. Gericke's data allow one to rule out temperature, but the author himself suggests the possibihty of light as the hmiting factor. The seeds were sown during the end of May and the beginning ot June. ..
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