Some Observations on the Reversibility of Ricôme's Effect in Grape Vine. The author continued his studies on the variations of grape shoots growth caused by the change of their direction. After the results obtained, he concluded that the linear growth of the shoots in vegetation placed in the opposite direction to the gravitation is always more active than that of the shoots directed parallelly to the gravitation and that we had to affirm the existence of a concrete liaison between variations of the morphological quantities and those of the biochemical quantities. The figures given by the chemical analysis of the shoots placed in the two directions quite opposite showed us that both nitrogen and carbohydrate contents are more ample in the shoots grown uprightly than in those directed freely downward and that the nitrogen content is relatively small in comparison with the carbohydrate in the shoots grown towards the earth than those which grew uprightly. The author observed in this experiment that the physiological reaction, caused by the change of the direction, appeared but some days after the operation and that it became more and more acute to some measure. The author added in this paper that he could not accept non-conditionally the physiological value of the C/N and pointed out that the absolute quantity of nitrogen or carbohydrate in plantt tissues should play rather an important rôle and lie thinks then much of the m value of the Cm/N for the pomological researches.
(1) Placing the fruits of Japanese persimmon in the evacuated container for several days results in a more rapid loss of astringency than in the check specimens. (2) The fruits treated with partial vacuum do not become soft as rapidly as the fruits treated with ethylene. (3) Partial vacuum has the same tendency to retard subsequent proper ripening as carbon dioxide treatment, but retardation does not occur to so groat an extent as in the case of the fruits subjected to carbon dioxide treatment. The writer gratefully acknowledges the helpful suggestions and advices of Dr. E. L. Overholser, in whose laboratory of the University of California this work was done. Institute of Horticulture, College of Agriculture, Tokyo Imperial University, Komaba, Tokyo, Japan