Paper, 'Experiments concerning the motion of the sap in trees made this spring' by Francis Willughby and Mr [John] Wray [Ray] An account of 13 experiments carried out on sap from birch, willow, and sycamore trees as the weather changed in the spring. Subject: Botany Published in Philosophical Transactions as 'Experiments concerning the motion of the sap in trees, made this spring by Mr. Willugby, and Mr. Wray, Fellowes of the R. Society: and communicated to the publisher of the inquiries touching that subject in Numb. 40',, vol 4, no 48, p 963. Read to the Royal Society in June 1669. [1669]