Reactions to Light in Planaria Maculata With Special Reference to the Function a
Reactions to Light in Planaria Maculata With Special Reference to the Function a
William Hay Taliaferro
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The heat waves were of course further absorbed by passing through the water of the aquarium in which the animals were placed. The stand on which the aquarium rested was the same height as a microscope stage so that in carefully observing the path of an ani- mal a microscope with a camera luoida attachment could be substituted for the atand. V. Hen a microscope with a camera luoida was used a small drawing board was placed beside the microscope (o. Flg. Li and illuminated by a small light which ...was so screened that no light could strike the animals under observation. In tracing the paths of specimens with a microscope and camera lucida it was found quite advisable to use very low magnifications. The use of very low objectives (1-8 inch; and eyepieces not only permitted the observation of speclniens over a greater range but it also obviated the necessity of pro- viding any vertical illtunination for the mloroBcope, the horizontal beam of light used in the experiment being quite sufficient.
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