Abstract
A comprehensive analysis of the ciphers invented by Charles L. Dodgson (Lewis Carroll) and how he used them indicate that his Memoria Technica (1875), a variant of a mnemonic scheme first proposed by Richard Grey in 1730, is properly viewed as Dodgson's fifth cipher system. He used his Memoria Technica cipher as a tool in work that was never published, a projected book whose working title was “Logarithms by Lightning: A Mathematical Curiosity.” The logarithms project, a joint work with his colleague, Robert Edward Baynes, is examined in detail.
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