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Updated: September 15, 2025
The indicator required for this process is made by dipping strips of filter paper in a starch solution prepared as described on page 76, to which 1 gram of potassium iodide has been added. These strips are allowed to drain and spread upon a watch-glass until dry.
Ann Veronica wiped a scalpel, put a card over a watch-glass containing thin shreds of embryonic guinea-pig swimming in mauve stain, and dismantled her microscope. "I wish I understood more of biology," said Manning. "I'm ready," said Ann Veronica, closing her microscope-box with a click, and looking for one brief instant up the laboratory.
Thanks to these precautions, my charges have all the appearance of excellent health; they drink and thrive. But this state of things cannot last long. Soon ripe for the transformation, my grubs leave the dining-room of the watch-glass as they would have left the caterpillar's belly; they come to the ground to try and weave their tiny cocoons. They fail in the attempt and perish.
The student should remember that while there may be others who share the responsibility for the purity of materials in the laboratory of an institution, the responsibility will later be one which he must individually assume. The stoppers of reagent bottles should never be laid upon the desk, unless upon a clean watch-glass or paper.
I have covered the mouth of this glass flask, in which water is boiling, with a watch-glass. Do you see what happens? It rattles away like a valve chattering, because the steam rising from the boiling water sends the valve up and down, and forces itself out, and so makes it clatter. You can very easily perceive that the flask is quite full of steam, or else it would not force its way out.
"I am sorry," said he, "that there are no more fragments of the watch-glass, or whatever it was. The broken pieces were evidently picked up, with the exception of the one that I trod on, which was an isolated fragment that had been overlooked.
If either the top or bottom of the canister be convex, like the upper surface of a watch-glass, the contents are in a state of decomposition; the bulging being occasioned by the gases generated during the chemical changes. If the contents of the canister be sound, the top and bottom will be either quite flat, or slightly concave.
Even when he mentioned about the idea that by putting some water in his watch-glass he could, when the sun was overhead, use it as a burning-glass, the admiral stopped him to inquire about the watch. “Is it the one you are carrying now?” “Yes.” “Then let me look at it.
He wheeled his revolving chair away from the germs and fixed me with his keen eyes. "Recovering?" he echoed. "Impossible! Rallying, you mean. A mere flicker. I know my trade. She MUST die this evening." "Forgive my persistence," I replied; "but her temperature has gone down to ninety-nine and a trifle." He pushed away the bacilli in the nearest watch-glass quite angrily.
He says, too, that although junior to Joyce—the lad they rescued—Stephen was really the leader; that many of his suggestions were most valuable. Wilcox is particularly strong on the manner in which the lad contrived to kindle a fire by using his watch-glass filled with water as a burning-glass.
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