p. 58 and 59

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Worked in the afternoon on the canal measuring rock above that measured on the 27th - Saw some Martins (a species of swallow) this afternoon for the first time this spring.
March 31st
This morning I went along the line of the canal as far up as the bridge - saw the red maple in flower. In the afternoon we took the levels on the rock above the turnpike & was drove in by a shower...

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...of rain. Saw while I was at the upper end of the canal the common willow tree with leaves. [See note in this journal for Feb 6th 1828] From these observations on the trees it will appear that the vegetation this spring is about one month later than in 1827 and nearly two months later than the last.
In the evening I received a letter from Darius in which he give an article on locks, which he wrote for a book on Civil Engineering.