a tree, 5 ft. 11 in. in diameter, in which the disposition of the rings was remarkably regular. Rate of Growth of Kauri-tree 11 ft. in Diameter, measured on the narrowest radius (52·22 in.) from the pith to the circumference. (On account of the scarf made in cutting down the tree it would have been difficult to measure the tree on the longest radius.) Rate of Growth of Kauri-tree 5 ft. 11 in in Diameter, measured on the radius of 35·92 in? Rings of Growth (equal to Years of Ago), arranged in Groups of 25 Space in Inches occupied by each group of Rings. Rings of Growth (equal to Years of Ago), arranged in Groups of 25 Space in Inches occupied by each group of Rings. 25 1·00 25 2·50 50 1·12 50 3·00 75 3·00 75 3·25 100 3·50 100 3·25 125 3·00 125 3·12 150 2·00 150 3·62 175 3·50 175 3·12 200 2·75 200 2·62 225 3·75 225 3·00 250 6·62 250 2·62 275 4·62 275 2·25 300 3·75 300 2·12 325 2·50 320 1·45 350 3·25 375 2·75 400 2·62 425 3·12 450 0·75 476 1·18 Age of tree, 476 years. Average number of rings per inch of radius (5 ft. 6 in.), 7·2. Age of tree, 320 years. Average number of rings per inch of radius (2 ft. 11 in.), 9·1. Comparing these two tables, the first point to notice is the great difference in the rate of growth of the two trees during the first fifty years. The 11 ft. tree produced only 2·12 in. of radius during this period, showing an average of 23·6 rings per inch of radius; while the smaller tree built up 5·5 in. of radius, with an average of 9·09 per inch, its rate of growth being approximately two and a half times as great. But the rate of growth of a young kauri probably depends very largely on how far it is crowded by other trees. In support of this view, Mr. J. W. Hall, of Thames, has drawn my attention to the different behaviour of two trees of equal age in his plantation at Parawai (Nos. 5 and 6 of my tabular list). No. 5, planted in an open situation, has formed 4·3 in. of radius in thirty-eight years; No. 6, much crowded by other trees, had only produced 2·8 in. in the same period. The number of rings per inch of radius in these two trees works out at 8·9 and 13·5 respectively. The most interesting peculiarity disclosed by the ring measurement of the 11 ft. tree is the enormous increase of growth which took place between the 225th and 250th years, when no less than 6·62 in. of radius, equivalent to 13·24 in. of diameter, was formed, being at the rate of 3·7 rings for each inch. This is the largest rate of growth for a series of rings that I have observed, although single rings are sometimes seen from half an inch