Professor W. F. Massey asks what is meant by Rocky mountain red cedar (May, p.. 311). It is merely a marked variety of the common red cedar (Juniperus Virginiana). That it is truly indigenous to the Rocky mountains, and of ancient standing, appears to be evidenced by the fact that it is found along the Platte, four hundred miles eastward of the mountains, and on the banks and islands of all the streams that have their head waters in the mountains, but it is not found east of the Missouri. Under cultivation in Iowa it is a far more rapid grower than the indigenous cedar of northeast Iowa and Wisconsin, is less subject to fungous troubles, and above all it is handsomer on account of its silvery expression at the point of growth, Some of the selected specimens are nearly as silvery in foliage as the best specimens of the silver spruce (Picea pungens). As an ornamental and timber tree for the prairies it is superior to our native species, or to any variety I have met with on this continent. - J. L. Budd.