44 



BOTANY. 



uniformity ; sugar and yellow pine, with the western balsam fir, and Libocedrus, of which the 

 eye may take in at a glance even hundreds which reach or exceed the utmost capacity of th e 

 mills, and many which would furnish sticks a yard square and a hundred feet long, as straight 

 as an arrow, and almost without a knot. 



The resin of the sugar pine is less abundant than that of the P. ponderosa, is white or trans 

 parent like that of P. strobus. That which exudes from partially burnt trees, for the most part, 

 loses its terebinthine taste and smell, and acquires a sweetness nearly equal to that of sugar. 

 This sugar gives the tree its n^me, and is sometimes used for sweetening food. It has, however, 

 decided cathartic properties, and is oftener used by the frontier men as a medicine than a condi 

 ment. Its resemblance in taste, appearance, and properties to manna, strikes one instantly; and 

 but for a slight terebinthine flavor, it might be substituted for that drug, without the knuw- 

 ledge of the druggist or physician, its physical and medical properties are so very like. 



PINUS CEMBROIDES. The American Cembra pine. 

 P. CEMBROIDES, Zucc. Jour. Hort. Soc. 1&amp;gt;. 236. 



Pig. 15. 

 Fig. 15. Cone, leaves, scale, and seed of P. Cembroides, natural size. 



While exploring the passes of the Cascade mountains, about latitude 44 north, we first met 

 with this tree. 



We crossed the mountains several times at an altitude of about 7,000 feet, the line of perpetual 

 snow. After reaching an altitude of 5,500 feet, among the firs and spruces which cover the 

 mountain sides began to appear pines of a species then quite new to me. As we ascended we 

 left behind us Menzies and Douglas spruces, (A. Menziesii and A. Douglasii,) the western 

 balsam and silver firs, (P. grandis and P. amabitis,) which grow so luxuriantly below, and, at 

 the height of 6,500 feet, found the scattered clusters of trees to be composed of nearly equal 

 numbers of the pine to which I have alluded, and of a beautiful and then undescribed spruce, 

 which I have since called Abies Williamsonii. Still higher, at the extreme limit of vegetation, 

 the bleak and barren surfaces were held by this pine in a possession undisputed by other trees, 

 but opposed by the rigors of a climate which had bowed it to the ground, forcing it to grow in 



