john9221
ORANGE EKSTRAKLASA
Dołączył: 25 Sty 2011
Posty: 1674
Przeczytał: 0 tematów
Ostrzeżeń: 0/5
Skąd: England
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 Wysłany: Sob 9:36, 12 Lut 2011 |
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willseepresently.Forobserve
whatfollows.Hairgrowsatauniformrate―roughlyafiftiethofaninch
intwenty-fourhours.Itisconsequentlypossiblebymeasurementtofix
nearlyexactlytheageofanygivenpointonahair.Thusifwehavea
completehairandwefindatanypointinitadepositofarsenicby
measuringfromthatpointtotherootwecanfixwithinquitenarrow
limitsthe date on which that dose of arsenic was taken.
But is it possible to do this?
I asked.
Notinthecaseofasinglehairhereplied.Butinthecaseofatress
inwhichallthehairsareofthesameageitisperfectlypossible.Youwill
see the important bearing of this presently.
Toreturnnowtomyinvestigation.Ihadthebulkofacandleanda
tress of Stella's hair The questions to be settled were
1. Was there arsenic in the candle? and
2. Had Stella been poisoned with arsenic?
Ibeganbytrimmingthewaxmouldinreadinessforcastingandthen
Imadeananalysisofthetrimmings.Theresultwasthediscoveryofcon-
siderable quantities of arsenic in the wax.
Thatansweredthefirstquestion.Nextasthetressofhairwaslarger
thanwasrequiredforyourpurposeIventuredtosacrificeaportionofit
forapreliminarytest.Thattestalsogaveapositiveresult.Thequantity
ofarsenicwasofcourseveryminutebutstillitwasmeasurablebythe
delicatemethodsthatarepossibleindealingwitha [link widoczny dla zalogowanych]yilai:
[link widoczny dla zalogowanych]
I confess he is a worthy foe
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