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In page Canadian Aboriginal syllabics:

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As an amateur linguist, Evans was acquainted with the Devanagari script used in British India; in Devanagari, each letter stands for a syllable, and is modified to represent the vowel of that syllable. Such a system, now called an abugida, readily lent itself to writing a language such as Swampy Cree, which had a simple syllable structure of only eight consonants and four long or short vowels. Evans was also familiar with British shorthand, presumably Samuel Taylor's Universal Stenography, from his days as a merchant in England; and now he acquired familiarity with the newly published Pitman shorthand of 1837.