1914] LLOYD—PINUS RADIATA 315 
is very commonly seen in gardens, having either started by chance 
or by being planted. It is even used as a hedge plant, though of 
indifferent value for the purpose. But this circumstance leads 
often to the trimming of young trees, and so enables us to judge of 
the relative effect of traumatic stimulus as compared with another, 
namely, the amount of soil water, in producing unusual responses. 
It must be prefaced that the amount of soil water in the normal 
habitat of this pine runs down very markedly during the long grow- 
ing season, in spite of the moisture-laden atmosphere. Exact 
measurements are lacking, but the fact is sufficiently evident from 
the behavior of the vegetation in general, which becomes during 
the summer months of a distinctly xerophytic character. To this 
condition is due the gradual reduction in length of the fascicled 
leaves toward the apex of the season’s growth, giving to the foliage 
of the leaders a cone-on-cone profile. Purixrps' has observed the 
same fact in Pinus cembroides Zucc., the Mexican pifion, in the 
mountains of southern Arizona, in a habitat which may, as regards 
soil moisture at any rate, be compared pretty closely with Carmel. 
When grown in gardens, however, it generally happens that a 
Steater abundance of water is provided, toward which a marked 
Tesponse is shown, both in amount of growth and in abnormal 
behavior. This is most obvious in an open spot used as an experi- 
mental garden within the grounds of the Carnegie Laboratory. 
Here the soil is kept abundantly supplied with water from springs, 
and here grows a cluster of young trees with heights ranging up to 
30 feet or over. Aside from the generally well developed character 
of these, they all have fascicles which in the majority of cases 
proliferate. So numerous are the resulting short shoots that the 
Tanches become densely clothed, enough so as to quite hide the 
Parent shoot itself from view when looked at from above. 
Interest attaches to the phenomenon less because of the morpho- 
logical fact, since it has long been known that pine fascicles do 
sometimes proliferate? than because of their abundance and the 
* Plant World 14:66. ro1t. 
* For the literature on this see Tomson, R. B., The spur shoots of the pines (to 
@ppear in the next issue of this journal), the manuscript of which the author has kindly 
allowed me to see. 
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