Dr. Baxter's report on an experimental study of certain disinfectants.

  • Baxter, Evan Buchanan, 1844-1885.
Date:
[1875]
Catalogue details

Licence: Public Domain Mark

Credit: Dr. Baxter's report on an experimental study of certain disinfectants. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    35/42 (page 249)
    thus made to contain 4, 3, 2, 1, 5, and -25 per cent, respectively of the App. No. 6. disinfectant. They were set aside for some hours under a bell-jar. On Disinfectants, Eight fresh eprouvettes were in the meantime thoroughly roasted in the by Ur. Baxter flame of a Bunsen burner. Into each of these 3 c.c. of boiling Cohn were introduced, and they were set aside to cool undercover. When cool the first six were inoculated with one drop each of the six disin- fected solutions ; the seventh was left without interference ; the eighth was inoculated with a drop of the original liquid which was crowded with microzymes. Each inoculation was performed with a distinct pipette which had previously been roasted and cooled. The eight eprouvettes were then plugged with cotton wool, and set aside under a bell-jar. At the end of a week the first seven were found absolutely limpid and barren. The eighth was milky, and coated with a scum of bacteria. 2. The disinfected solutions contained the following proportions of permanganate: 1, •5, -25, '125, -0625, ‘03125 per cent. The test- liquids inoculated with all of them remained barren, while that inoculated with the original solution became quickly turbid. 3. Proportion per cent, of the permanganate: ‘125, ‘0625, ‘03125, 015625, 0079, ‘0039. The last solution only, that containing '0039 per cent, was found to have retained its infective power. II. Action of Chlorine on Septic Microzymes. nLPrr±nS jLWfght of chlorine iu disinfected solutions : -0428, Experiments barren °°428, '00214 Per cent- Test-liquids inoculated all proved with clllorine- .nnn7r°^°nti?ns °f ,?hl?rine Per cent.: ‘008, ‘004, ‘0016, ‘0008, ... 4' , . t le test-liquids remained barren except the last, inoculated with a solution which contained ‘0004 per cent, of the gas. 111. Action of Sulphur Dioxide on Septic Microzymes. periTTsO™ relitambaHen'd Wh th8 S0l“ti0n cont“ta“S '528 2. Proportion of S02 per cent. ‘495, -248, -123. All the test liquids remained barren. ue tcst .. 3. Pioportion of S02 per cent. -552, -776 -194 All tho t„c+ liquids proved barren. ’ AJ4' A1 tbe test_ IV. Action of Carbolic Acid on Septic Microzymes. 2, 1; Pr-Si0T°LCil°S mdr!ZiZt,ia disifcted ; 4, 3, E.ucri,,,™,, with solution containing -25 pel c7nt“tf iXT*1* liqnidaTnS^a *’ i25- 'I25' Test- three, fertile. V° pr0Ved barren> tb<>se with the last ^. Proportion of carbolic acid per cent. ] ■ 5 *25 -i o x -nror rP liquids inoculated with first two proved barren - with ht th i f The somewhat unexpected results of tl,00 c U .last *hlee> fertile, may be thus briefly summarised - the miernf f°U1’ °f exPeriments Summary of solution are completely deprived nf itn 3 ,mes'vIuch swai’m in Colin’s rcs,llts‘ permanganate, when prLn'Tnlhe 1EnT^f™ * f* by chlonne, when present in the proportionof foo™ PW Cent or more 5 y ’T:: when ^ propir„v.^“r:; Q