. The Dental cosmos. struments are suspended in a mixtureof 70 per cent, alcohol one-half gallon,and chemically pure glycerin about onefluidounce. The glycerin is addedmerely for the purpose of imparting tothe alcohol a slightly lubricating in the strength of from 60 to 70per cent, has the greatest germicidalpower according to the findings of Leed-ham-Greenef and Post andXieoll claim germicidal power for solu- * Deutsche Zahnarztl. Wochenschrift, June13, 1014, p. 464. f The Local Preparation of Patients forOperation. By A. D. Whiting, Journ. Association. Augus
. The Dental cosmos. struments are suspended in a mixtureof 70 per cent, alcohol one-half gallon,and chemically pure glycerin about onefluidounce. The glycerin is addedmerely for the purpose of imparting tothe alcohol a slightly lubricating in the strength of from 60 to 70per cent, has the greatest germicidalpower according to the findings of Leed-ham-Greenef and Post andXieoll claim germicidal power for solu- * Deutsche Zahnarztl. Wochenschrift, June13, 1014, p. 464. f The Local Preparation of Patients forOperation. By A. D. Whiting, Journ. Association. August 8, 1014. | See Miinch. Med. Wochenschrift, 1012. tions as weak as 30 per cent., while, onthe other hand, Kochs and Sternbergsexperiments have shown that chemicallypure alcohol and 95 per cent, alcohol iswithout germicidal effect. The mixtureindicated by Fischer, of two parts abso-lute alcohol and one part glycerin, makesthe instruments very disagreeable to thetouch, and slippery, if the glycerin has Fig. Writers anatomic specimen jar for pre-serving syringes, dissolving-cup, pliers, andlancet. not been completely washed off ; it alsorequires a more lengthy and tediouswashing in boiling sterilized water toremove all traces of the preserving solu-tion, which, if injected hypodermicallywith the novocain-suprarenin solution,would produce most undesirably pro-longed anesthesia. The boiling water drawn up into thesyringe to rinse out the alcohol andglycerin should never be squirted backinto the sterilizer, since by doing so the 1328 THE DENTAL COSMOS. water in the sterilizer is mixed withtraces of glycerin, and the interior ofthe syringe barrel really is not freedentirely from this undesirable admix-ture. Clamping of the cross-bar to the rub-ber ring fitting to the edge of the jarprevents all ingress of air, dust, andbacteria, also the sticking of the lidso often encountered if ground-glass Fig. 4.
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