. Carnegie Institution of Washington publication. GROWTH IN TREES. 27 March 16, after which acceleration carried growth to a maximum rate in the last 10 days of April. The rate now slackened and growth ceased about June 1, with a total increase of mm. in diameter. A rain on June 14 was followed by some growth in the following week, after a period of reversible alterations ensued. Not until late in July did a slight enlargement recur and a similar impulse was re- corded at the end of August (fig. 8). No further increase could be detected, but a shrinkage began on October 11 which continued
. Carnegie Institution of Washington publication. GROWTH IN TREES. 27 March 16, after which acceleration carried growth to a maximum rate in the last 10 days of April. The rate now slackened and growth ceased about June 1, with a total increase of mm. in diameter. A rain on June 14 was followed by some growth in the following week, after a period of reversible alterations ensued. Not until late in July did a slight enlargement recur and a similar impulse was re- corded at the end of August (fig. 8). No further increase could be detected, but a shrinkage began on October 11 which continued until SEPT. 10 1920 6PM 6AM 6PM GAM 6PM 6AM 6PM 6AM 6PM 6AM 6PM _6AM 6PM 6AM + 0- i-e- JUNE 2f 13 >0 A m ^ =^ ~^— •— -^^ =e 1 0-== n • N KI ^ ~*H -^ <==: •^=- ^"- — ^ ^ ^=" .S* ^^— • ^ , _— — ~ **— _ n APRI L 12 19 >o i n *— — • 1 " _•*•*•" X ^•.* * — >v -- — — s ^— ^ — i^ \c~ •• — ~^*, ^- ^— ^ — " -~^. •**—. s~ ,^-- rt ^•^ v ^x_ /*. FIG. 8.—Dendrographic records of Monterey pine No. 6, with no growth in week of March 1, 1920, beginning growth in week of March 22-29, vigorous enlargement in week April 12-19 daily equalizing variations of wide amplitude in week of June 28-July 5, and reduced variations late in September. Variations X 5 on scale of 10 mm. intervals. the instrument was dismounted a week later. A total increase of 5 mm. had been recorded. It is to be noted that the terminals and tips of the branches had made a growth of several centimeters when the observations were begun, and that such elongation must have started about two months prior to the increase in the trunk. Measurement of another pine (Pwms chihuahuana), on the slopes of the Santa Catalina mountains, an isolated range near the Desert Laboratory, gave a set of results under conditions different from those afforded by the indeterminate seasons of the coastal climate. A tree 40 cm. in diameter, in the lower e
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