By L. Sprague De Camp
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Additional info for A Gun for Dinosaur
The apartments could be entered only through a corridor separated by two thick doors, each of which could be opened only if the other one were closed. This hallway served as a link between the time-free world inside to the time-driven world outside. Subjects placed their shopping lists or bottles with urine samples on the shelves of this corridor. The urine was used to monitor the daily rhythms of metabolites, such as potassium or calcium, as well as substances that allowed the scientists to estimate ups and downs of hormones.
In this case, the body clock produces days of exactly twenty-four hours, and you can probably guess by now that in this example the animal was kept in a light–dark cycle.
He put it down as far away from the desk as possible. Being adapted to the night’s darkness, he was able to see very well in the barely lit room. He opened his desk’s door a tiny crack, enough to see that the mimosa had already started to lift its leaves. He continued his little experiment for several days and found that the mimosa’s leaf movements continued with the same regularity as if it were still standing on the windowsill. The plant evidently continued to “know” the sun’s position and continued to be “aware” of night and day.