11 
of stock to cion in a very "broad way, a question which we 
must soon consider in connection with many of our fruits. 
9. Reimer has started in to work not only with 
species of Pyrus "but with varieties as well, and with many 
comtinations of both. He has used careful "bacteriological 
methods and with pure cultures of the pear "blight organism 
has, "by process of elimination and rigid check tests, se- 
cured readings on about five species which appear promis- 
ing as blight resistant. There are three or four varieties 
that also react favorably. 
10. One species, P. ussuriensis . is absolutely blight 
proof to date, notwithstanding many hundreds of infections 
have been made in all sorts of ways. This work has been 
going on for two years or more now. Some of the trees are 
so scarred with infection marks that they look as if a 
double barrelled shot gun, loaded with buck shot, had been 
used on them. Hot only has this method of infection been 
used but the most susceptible varieties have been budded 
and grafted on to the resistant types and these in turn 
have been infected. P. ussuriensis . so far, stands ab- 
solutely bligiht proof. 
11.^ From careful botanical comparisons with all other 
forms and species, it appears that P. ussuriensis is wholly 
distinct. Besides the plant at Talent, there is only one 
tree in the country and that is at the Arnold Arboretimi. 
December 31, 1916. 
