
          96

when the temperature of the surrounding air is considerably above
the freezing point: but the bacteria are probably most active in
the Summer time.

"Judging from my experiments upon the pear tree, the destroyers
only gain entrance to the tissues of the tree through wounds
in the epidermis or bark; but it is possible that at the time of
flowering they penetrate by way of the stigma, which is not protected
by an impervious coating.

"The cellulose tissue of the tree is not destroyed, and it is
still a puzzle how the bacteria, minute as they are, pass from cell
to cell.  As in the pear, it is probably a very slow process, and
is not connected with the circulation of fluids in the tissues.&quot;-
Prof. T. J. Burrill in Science. Quoted in An. Rep. Sec'y. Mich. State Hort.
Soc. 1880. p 383.

An endeavor was made by Dr. R. C. Kedzie in 1880 to collect evidence
as to whether premature peaches have caused sickness.  But little
attention was paid to the Circular then sent out. p. 179, An.
Rep. Sec'y. Mich. St. Hort. Soc., 1880.

"He [T. T. Lyon, August, 1880] once received some trees from
Georgia [from Mr. Berckmans'] that showed yellows the first year
in the stock, below the bud, showing the original tree to have been
affected"- Ib., p. 273.

Mr. Lyon continued:- "He thought there was less yellows at the
far South." p 273.

"He had heard that Wetsern [Western] N. Y. was free from yellows but last
        