The fact this was discovered in the RCC Library, the question arose as to the origin of the poem.
The Zodiac Killer seemed to draw inspiration from many sources of yesteryear, such as in the 408 Cipher, which contained the phrase "the most dangerous animal," believed to be referring to a short story 'The Most Dangerous Game' by Richard Connell first published on January 19th 1924. The Mikado, paraphrased in his Little List' and 'Exorcist' letters, first viewed by the paying public in 1885, and possibly Charlie Chan, created by Earl Derr Biggers in 1919. His costumed appearance at Lake Berryessa and his use of words, predominantly used by the British, made some people believe he may have been connected to the theater, in addition to being a well read individual. The RCC Library no doubt was well stocked and may likely have held the answer.
This poem, apart from the very short Bates letters mailed on April 30th 1967, was effectively the preceding correspondence of any substance, before the 408 Cipher arrived, mailed on July 31st 1969, some 2 1/2 years later. So can any connection be forged.
Edward Hyde, Earl of Clarendon, Lord High Chancellor of England, was an English statesman and historian, and here is a catalog of English literary manuscripts with one important section "Naturally a substantial portion of Clarendon's surviving manuscripts comprises his personal correspondence — both letters received by him from numerous correspondents and his own letters, written or signed by him, whether drafts, retained copies, or the letters actually sent. Among many notable examples are his letters written in August 1646 to William, Lord Widdrington, and to Sir John Berkeley, announcing the beginnings of his History of the Rebellion, and the letter he wrote on 12 November 1646, to Sir Edward Nicholas, describing his plan for the work and stating that he had already completed sixty sheets of it. Some of his letters, particularly those dating from the Civil War period, are wholly or partly in cipher or make use of pseudonyms in both salutations and signatures. The codes to sixteen such ciphers used by the Royalists are written out in Bodleian, MS Clarendon 94, and see also British Library,"
Dave Oranchak, the foremost expert on the Zodiac ciphers wrote "So, only one piece of text, from a vast collection of eleven billion pieces of text, fit into this chunk of cipher text. A one in eleven billion chance seems to suggest some significance. But don’t be fooled by this. Just because this rare event occurred, doesn’t mean it is anything more than a simple coincidence. If we didn’t already know the real solution to the 408, how do we know that this chunk of old and obscure text isn’t the correct solution? "
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This is when I noticed another piece of obscure text from Edward, Earl of Clarendon and flew back to the last piece of notable text from the presumed Zodiac Killer on the Riverside desktop, the title of which was "sick of living/unwilling to die."
One of Edward Hyde's quotes was “They who are most weary of life, and yet are most unwilling to die, are such who have lived to no purpose, — who have rather breathed than lived.” http://izquotes.com/quote/385232.
Although not perfect, I couldn't help wondering if the Zodiac Killer was recalling from memory, as he did with 'The Mikado.'
Taking "weary of life, unwilling to die" to "sick of living, unwilling to die," and then somehow incorporating another of Edward Hyde's quotes into the 408 cipher, as a form of link between the two.
As Dave Oranchak said "Just because this rare event occurred, doesn’t mean it is anything more than a simple coincidence," and it just may prove the case, that we are the 'The Most Pattern-Seeking Animal of All."