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Updated: May 15, 2025
If a volatile alkaloid, add a few pieces of calcium chloride to ethereal solution to absorb the water; draw off the ethereal solution with a pipette, allow it to evaporate, and test the residue for the alkaloids, conine and nicotine.
The precipitate formed is allowed to settle, 50 c.c. of the supernatant solution is removed with a pipette and transferred to a beaker; 50 c.c. of decinormal nitric acid and some water is added with sufficient cochineal tincture.
"To use this instrument the must and the tincture of litmus, having first received the normal temperature of 14° Reaumer, are brought into the mixing bottle by means of the pipette, which is a hollow tube of glass, open on both ends.
Spirit of turpentine is poured into the pipette; it descends, issues from the end in minute drops, which rise in succession to the surface. On reaching it, each drop spreads suddenly out as a film, and glowing colours immediately flash forth upon the screen. The colours change as the thickness of the film changes by evaporation.
A twice perforated stopper is fitted to this flask, carrying through one opening a 25 c c. pipette nearly filled with sulphuric acid, sp. gr. 1.4, the lower point of which just dips below the mixture in the flask, and the upper end, carrying a rubber tube and pinch cock to control the flow of acid.
"People who wantonly risk infection ought to be hauled up and punished for it," muttered Korostelev, not answering Olga Ivanovna's question. "Do you know why he caught it? On Tuesday he was sucking up the mucus through a pipette from a boy with diphtheria. And what for? It was stupid.... Just from folly...." "Is it dangerous, very?" asked Olga Ivanovna. "Yes; they say it is the malignant form.
It is plain that any temperature which is deemed most convenient might be chosen for a particular laboratory, but it cannot be too strongly emphasized that all measuring instruments, including burettes, pipettes, and flasks, should be calibrated at that temperature in order that the contents of each burette, pipette, etc., shall be comparable with that of every other instrument, thus permitting general interchange and substitution.
Humiliating as it may seem to the scientific reader, I found it impossible to maintain a Platonic attitude any longer; and applying my mouth to the embouchure of the pipette, warbled faintly in an exquisite falsetto: "Ulat tanalareezul Savourneen Dheelish tradioun marexil Vi-Koko for the hair. I want yer, ma honey." The effect was nothing short of magical.
Inserting a pipette through the keyhole and cautiously applying my eye, I saw to my delight that the Crinoline had been elevated on a series of steel rods about six feet high, and that the five Wenuses who had descended in it were partaking of a light but sumptuous repast beneath its iridescent canopy.
If danger of more carbonic acid being absorbed from the air is feared, and always in very accurate analysis, a potassa tube may be connected to the pipette before drawing the air through.
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