_Du jour a l'aube_ was the next arrangement. He wrote it under the
printed words and began to apply the Square.
The D and the A yielded A; the U and the B yielded V; the J and the C
yielded E; the O and the D yielded R; the U and the E yielded T; the R
and the F yielded I.
"_Averti!_"
Carpenter gave a soft whistle of satisfaction. French, it was--his hunch
had not deceived him. The key-word was found!
Swiftly he worked out the rest of the cipher, setting down the letters
of the translation without regard to words. "_Averti_" was evident
because it was the first word. At the end, he had this result:
AVERTIQUELALLEMAGNEAENGAG
EUNOFFICIERADECELERLAFORM
ULESECRETEDESETATSUNISEMP
LOYEEACOLLODONNIERLAFULMI
COTONPOURLAPOUDRESANSFUME
EALARTILLERIEDEGROSCALIBR
EETQUEMADELINESPENCEREMIS
SAIREDELALLEMAGNEAPARISPH
OTOGRAPHIECIINCLUSEAETECH
ARGEEDELARECEVOIRNESEPEUT
DECOUVRIRLENOMDUTRAITRESP
ENCERESTPARTIEPOURNEWYORK
SURLALUSITANIAQUIDOITARRI
VERLEQUATORZEATOUTEFORCEI
NTERCEPTEZLAFORMULEOUEMPE
CHEZAMOINSQUELALLEMAGNENE
LOBTIENNESPENCERSIMPORTAN
TEALAFRANCE
There was not the least doubt as to it being in French--the last three
words, as well as the first, proved it; also that he had the correct
key-word.
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