. Carnegie Institution of Washington publication. PLATE 101. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Carnegie Institution of Washington. Washington, Carnegie Institution of Washington

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RM2AWDB5X–Mutants and hybrids of the oenotheras . m m S)0(Hjg - • ••???••??. WASHINGTON, D. C.:Published by the Carnegie Institution of Washington 1905 Carnegie Institution of Washington, Publication No. 24, Papers of Station for Experimental Evolution atCold Spring Harbor, New York. No. 2. PRESS OF HENRY E. WILKENS PRINTING CO. WASHINGTON, D. C. PLATE I.mutantshybridsof00macd

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RM2CEHNC0–. Carnegie Institution of Washington publication. 4 The values of dd/dNc observed and computed obviously agree as closelyas may be expected for mean conditions of the spectrum between green andred and of the mode of procedure. The small coefficient for carbon bisul-phide is, moreover, in keeping with its large value of B or high dispersion.In a sensitive displacement interferometer B like E D should all be small;but unfortunately this implies large ellipses. The beautiful small ellipsesobtained with the carbon-bisulphide plate are of little avail because of theirsluggish motion. In fact, the s

RM2CEHP29–. Carnegie Institution of Washington publication. -J 77 78 The first result is particularly interesting, inasmuch as it is thus possibleto displace the centers of ellipses not only horizontally as usual relative tothe fixed sodium lines in the spectrum, but also vertically relatively to thefixed horizontal shadow in the spectrum due to the fine wire across the slit.The following experiment was made to coordinate the vertical displacementof the component rays and centers of elliptic fringes: A glass plate d = 0.705cm. thick was placed nearly normally in the beam ac, figure 74, and providedwit

RM2CEJ1KR–. Carnegie Institution of Washington publication. N and M, each arm terminating in a fine horizontal set-screw, s, s, below,adapted to push against the rim of the iron block. In this way adequatelystationary conditions and an elastic fine adjustment for superposed longi-tudinal spectrum axes were both secured with advantage. Similar elasticadjustments have been recently applied. It was now possible to manipulatethe micrometer at M by hand; but a glass-plate compensator C, rotated by atangent screw over a graduated arc, was also convenient. Later other typeswere attached, including an air-compe

RM2CEHP6W–. Carnegie Institution of Washington publication. ciably changing the direction of therays. In other words, one illuminated spot at d, figure 74, is to move verticallyrelative to the other by a small amount. This may be done by placing athick plate-glass compensator, such as is shown in figure 77, in each of thecomponent beams abd and acd and suitably rotating one plate relative to theother, each on a horizontal axis. Very little rotation is required. In the sameway elliptical fringes may be changed to nearly linear horizontal fringeswhen desirable. If the fringes are to be sharp the slit must

RM2CEHWA3–. Carnegie Institution of Washington publication. 17 Film grating 6,400. .208 Three or more measurements, completed in each case, were in good agree-ment. The attempt was also made to use a 45° prism here, but the spectrawere too small and the fringes could not be found. In each of these casesthe value of o.y for the plate £ = 0.434 cm., as shown in table 14, series III,IV, V, are virtually the same. The rapid increase of range of displacementwith the dispersion of the system is thus again encountered. 33. Rotation of fringes.—A word must now be given relative to the rotationof fringes, which

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RM2CEHRCR–. Carnegie Institution of Washington publication. d absence of the plate to be tested. In the case of liquids the empty and REVERSED AND NON-REVERSED SPECTRA. 101 the filled trough are similarly compared. Data of this kind for a dilute solu-tion of mercury-potassic iodide and two kinds of glass are given in table 25.A/a is the micrometer reading at M for the half-silvered plate alone. In caseof the solution, it is to include the glass plate of the trough. N—Na = AN. TABLE 25.—Dispersion constants. Fraunhofer XXio6 Na (i) vSolution.£ = 0.293 cm- (2) Trough glass.6 = 0.562 cm. (3) Glass plate.e

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