of an individual plant beyond its normal
seven or eight years.

The other American hazel, variously known as the beaked hazel, tailed
hazel or horned hazel, was named _Corylus cornuta_ by Marshall
(Arbustrum Americanum 37, 1785). Consequently, that is the name by which
it should be known instead of the name _Corylus rostrata_ which was
bestowed subsequently. This hazel has a much more northern range than
the common American hazel and I have seen it in Labrador and in Ontario
nearly to Hudson's Bay. On the Pacific coast it is said to reach a
height of thirty feet. Although spreading by stoloniferous roots like
the common American hazel, these roots are shorter, and it does not
extend rapidly enough to dominate the situation when growing in
competition with the common hazel.

The nuts, while very good, and sometimes of large size with
comparatively thin shell, lack quality, a very important element in any
nut. It is probable that this tailed hazel will be valuable for adding
hardiness to hybrids with the European and Asiatic hazels, when the time
comes for horticulturists of Canada to make fortunes from their hazel
orchards.

In Europe and Asia and in the northern parts of Africa several species
of hazels are extremely important commercially, sometimes furnishing the
chief source of income for large districts, very much as wheat or corn
make special crops over large areas in this country.

These foreign hazels have not been raised successfully in our country,
excepting very recently on the northwest coast. The reason for failure
depends almost wholly upon the presence of a blight, _Cryptosporella
anomala_, which belongs to our native hazels. In the course of
evolution, host and parasite have come to be peers of each other, and
consequently this blight does not menace our native hazels very
seriously. Introduced species, with the exception, perhaps, of the
Byzantine hazel, appear to carry a protoplasm which has not learned to
resist the attacks of the blight. All organic warfare is fundamentally
enzymic in its nature, and it is possible that through process of
natural selection some of the foreign hazels would eventually become
securely established in this country, without aid from the nurseryman.

As a matter of fact, the hazel blight is very easily managed. Not
knowing this at first, I allowed almost all of my exotic hazels to
become destroyed, and a number of nurserymen told me of having given up
the problem as h