8 BULLETIN OF THE BUSSEY INSTITUTION. 
weaker solutions of chemicals must be used than are suitable for 
spraying many other plants. For this reason, many varieties or 
individuals might find it more difficult to become acclimated than 
if the peach and its relatives were more hardy. And it may be 
true that there are already in existence more acclimated varieties 
than have yet been discovered by the scientist. The discourage- 
ment caused by negative results in the past should not lead too 
easily to the impression that positive results are unattainable. 
Further investigation may lead to their discovery. 
The observations of Mr. Hersey indicate the probability that 
many other farmers may have had similar experiences to his. 
Thus, upon a farm in southern New Hampshire, owned by the 
writer of this article, there are some twenty peach trees, and most 
of the neighbors have at least that number and some of them 
many more than twenty. Since I have been acquainted with that 
locality, — eleven years, — although we have had other infirmities 
of the peach tree, no case of ‘‘ yellows” has appeared upon my 
farm or upon those of my neighbors, as far as I know. The 
trees appear to be acclimated, but whether or not they are suffi- 
ciently so to be able to survive if the ‘‘ yellows” appeared in the 
vicinity, as has the Magdalene, no one is at present able to say. 
That Mr. Hersey has had on his land cases of genuine ** yellows” 
there can be no question. One reason why this variety has 
become so well adjusted to its present home is the fact that it 
has been grown so long in the same locality. Having obtained a 
foothold and become adapted to a particular climate and soil, the 
internal functions have had time to adjust themselves to the 
external conditions presented to them. This method of procedure 
is contrary to that usually practiced by our peach growers; the 
peach pits planted have come from trees grown in the South, 
which are thus subjected to a new and violent change, in addition 
to that which the parent tree experienced when first imported from 
its foreign home. Thus, for a second time, have the normal 
functions been disturbed. ‘This process when repeated several 
times, as it often has been, can hardly fail to affect any plant not 
having the qualities which give to it the characteristic of ‘* hardi- 
ness,” and which are so conspicuously lacking in the peach. Each 
change requires a readjustment to new conditions, with the result 
that before the tree has had time to accustom itself to a certain 
