News P4C Tree Remeasuring at Appleby College Written by admin on September 23rd, 2014February 9th, 2021. On Sept. 23rd, 2014, the students remeasured the trees planted in 2008. The trees are now “mature” trees (> 4 cm in diameter at 1.3 m) and the students used clinometers to calculated the height of their trees. Appleby College’s P4C plot