Logs are logarithms, Napier's Bones were a very early calculating device produced by the inventor of logarithms
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The spaces between the logs are filled with chinking.
Logs are meant to be read to the public and are factual, Diaries are personal and opinionated.
Firstly, the 1st row has 21 logs, the last has 15. The difference is 6, though the number of terms is 7. (21 - 14 = 7), and 7/7 (per row) is 1. Thus, it decreases by 1 every row. So we have an addition problem:21 + 20 + 19 + 18 + 17 + 16 + 15 = 3(36) + 18 = 108 + 18 = 126.
Fertilizer - nutrients and minerals from the log.