. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DROSOPHILA MELANOGASTER 101 come from the surface values to linear values which has been done by calculating the length of the cell, which was obtained by taking a square root of the surface of the cell. The data on wing length gave the possibility to calculate the percental decrease in the wing length taking the wing length of 18° flies as a basis. Multiplying by this percental decrease in wing length the number giving the " length " of cell in cold temperature (18°) flies, we obtained the figures represented in o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DROSOPHILA MELANOGASTER 101 come from the surface values to linear values which has been done by calculating the length of the cell, which was obtained by taking a square root of the surface of the cell. The data on wing length gave the possibility to calculate the percental decrease in the wing length taking the wing length of 18° flies as a basis. Multiplying by this percental decrease in wing length the number giving the " length " of cell in cold temperature (18°) flies, we obtained the figures represented in our table under the heading " Calculated length of ; Comparing them with the dimensions obtained by taking the square root, we can easily see that the assumption that the wing length varies proportionally to the length of its constituents does not hold true. The three columns on the right of Table VII represent the changes in wing size and cell size expressed in per cent of 18° (cold) flies. The same relationship between these two characteristics is shown in a percental scale on Fig. 7, the diagonal line represents the relationship in case of a proportional change in wing length and cell length; the dotted line shows the actual percental decrease in cell size in different groups of our flies. SO 6O 7O SO SO /OO /O 2O ~30. /O 20 JO SO 6O 7O 8O SO SOO Length of Me Length of the FIG. 7. The dotted lines represent the relationship between the percentage of decrease of the wing length and the percental decrease in the corresponding percental length of the cells calculated by taking the square root of the surface of the cells. The general conclusion of all these calculations is that the reduced size of cells alone cannot explain the reduction of the organ. The only possible way to explain it is the assumption that the decrease in the organ size—in our case in wing size—is not the result of a decreased size of its cells alone, but also of a reduced number of cell
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
