Stokes' Law of Fall Completely Corrected.

end increased there was an increase in the mean length of lateral produced from each bud. In the first group a maximum was reached at about the 48th bud. The maximum length of lateral in the second group'was attained near the 80th bud, and in the third group near the 119th bud. The second group overlaps the margins of the adjoining groups and the calculated values of the overlapping portions must be added to approximate the observed values. The satisfactory agreement between observed and calculated values seems to justify the conclusion that the length of each lateral shoot was a function of its position in its group and, consequently, of its position on the branch. To perhaps an even greater extent, the size of the cycle depends upon its position on the branch. The decreasing amplitude of the three curves suggests that the successive cycles of laterals may represent damped oscillations of the growth process. The limits of the third group are, however, too poorly defined to afford satisfactory material for study. In any case, the present study adds something to the already extensive evidence which indicates that the processes of growth are characteristically cyclical. 1 Paper No. 105, University of California, Graduate School of Tropical Agriculture and Citrus Experiment Station, Riverside, California. 2 Cf. Reed; H. S., Table 1, PROC. NAT. ACAD. SCI., Washington, 6, 1920 (397-410).