esent and spreading onto the
native trees. There were, however, several established orchards which he
visited where that was not the case, where the disease was not present.
It has been brought out repeatedly that, while the chestnut blight is
marvelously adapted to spread by natural means--wind, birds, insects,
rain, all the ways in which a plant disease ordinarily spreads--the way
in which it spreads over great areas and through great distances is on
chestnut nursery stock.

In that connection, then, I may briefly discuss the present range of the
disease so far as we know it, outside of the natural range of the
chestnut tree. South of Virginia, so far as we know, the disease is
present at only one point (Greensboro, N. C.), where it was introduced
in a nursery and spread to native trees. In stating this area of
distribution, I ought to say that for about a year and a half we have
made no special effort to determine the range of this disease. I mean we
have not gone out of our way to do it. We have simply collected such
evidence as has come to hand casually, and so it may be that there are
now other points of infection in North Carolina, or south of there, but,
if so, we do not know of them. In Ohio, the disease is present at three
points, of which one is a large and serious infection at Painesville. In
Iowa, it is present at one point, Shenandoah, in a nursery. In Indiana,
it is present at five points; in Nebraska, at two points. In Michigan,
one point has been reported. In all of these cases it is in nurseries,
or on very recently planted trees. There is, or was, an interesting
point of infection in British Columbia. Probably the trees there are all
dead by this time, but that point is very interesting as being probably
an independent importation from the Orient.

There needs to be little said as to how the disease is spreading in this
area. Perhaps the best thing I can do is to read some letters that have
come to my attention:

"MICHIGAN AGRICULTURAL COLLEGE,
"EAST LANSING,
"Aug. 18, 1916.

"Dr. Haven Metcalf,
"U. S. Dept. of Agriculture,
"Washington, D. C.

"Dear Mr. Metcalf:

"Last December, the Forestry Department of this College ordered of Glen
Bros., Glenwood Nurseries, Rochester, New York, five 6-foot trees of the
Sober Paragon chestnut. These were shipped to them April 4th and were
almost immediately planted in the Forestry Nursery here. About six or
eight weeks ago, the Forestr