The Journal of experimental zoology . s are indicated in graph 4. From this it appears that if theenergy transmitted by the colorless flasks be represented by 100 92 ROBERT STANLEY McEWEN per cent, then the red flask transmits 103 per cent, the green 64per cent and the violet 51 per cent. The fact that the red flaskactually transmits more than the white is explained by the factthat the layer of clear water was slightly thicker than the redsolution. It will be noted, however, that in the visible spectrumthe red is somewhat less than the white, while the green and theviolet are approximately equ
The Journal of experimental zoology . s are indicated in graph 4. From this it appears that if theenergy transmitted by the colorless flasks be represented by 100 92 ROBERT STANLEY McEWEN per cent, then the red flask transmits 103 per cent, the green 64per cent and the violet 51 per cent. The fact that the red flaskactually transmits more than the white is explained by the factthat the layer of clear water was slightly thicker than the redsolution. It will be noted, however, that in the visible spectrumthe red is somewhat less than the white, while the green and theviolet are approximately equal. The first colored light experiments performed were under-taken in the Zoological Laboratory of Western Reserve Univer-sity, Cleveland, Ohio, during the summer of 1916. After somepreliminary experimentation it was decided to make use of Curves showing relation between galvanometerdeflections and scale readings ^\ |[^^ ,^_y?e*/e-l 7 cm•?He — i +•-•?). Scale readingsGraph 4 REACTIONS TO LIGHT AND GRAVITY IN DROSOPHILA 93 method 11.^ Four sets of flies were employed, each set consist-ing of six males and six females, the sexes being tested separatelyas usual. Every test consisted of three trials which were aver-aged to obtain the index for that test. Each of the four sets offlies was tested once for each of the three colors, the successivetests coming at intervals of 2 hours. For each set, however, thearrangement of the colors in the series was varied. Thus for setA it was red, green, violet; for set B, red, violet, green; for set C,violet, green; red; and for set D, green, red, violet. The resultsof these tests when averaged together for the four groups were asfollows: males—violet, 64, red, , green, ; females—violet,, red, , green, In every one of the four sets violetwas first in each complete test for males and females. As be-tween green and red, red won in three out of the four sets forboth males and fem
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectzoology
