188] OPEN LETTERS 205 
may be prevented. For the information set forth in these lectures and 
papers | am in no way indebted to Dr. Russell. 
The paper reviewed in the GAZETTE was sent to the Centralblatt early in 
the spring of 1897. Proof on the whole of it was read and returned May 4. 
Some reprints of the paper were distributed in this country September 29 
and the rest October 23. Up to the date of this writing (January 28) Dr. 
Russell has, on the contrary, so far as I know, not published any important 
information respecting this parasite Pseudomonas campestris (Pammel), in 
fact, he did not seem to know of Professor Pammel’s paper until I called his 
attention to it. Whatever “advance sheets” the reviewer may have seen, I 
have not seen any, neither has the general public, nor do I know what their 
he may be. The expression, “some of which have already been pub- 
. probably alludes to a paper by Dr. Russell, which was read at the 
Springfield meeting of the A. A. A. S. in August 1895. 1 was not present 
at that meeting and never learned orally or through writing as to the con- 
tents of this paper. I desired very much to read the paper, but it was with- 
a publication, and the only abstract of any value which I have been 
to find is in the Proceedings of A. A. A. S. 44 : 193. 1895. I might 
"ci ad to this short abstract and would have felt compelled to do so 
I been considering cabbage diseases in general, rather than writing a 
if a particular organism. This abstract I read carefully a number of 
investi is never found anything in it which in any way aided me in my 
had ete The symptoms of the disease are not carefully described, it 
evidently j n produced by inoculations with pure cultures, and the author was 
lowing a €rror as to the common natural methods of infection as the fol- 
Sean shows: “The disease is first noticeable in the axil of the 
‘eaves in the sulcus on the upper side of the petiole. This depres- 
usually filled with moisture and the disease often gains entrance at 
af * satiate the mechanical rents that are caused by the rapid growth 
Which I have a <gmatl On the contrary, the disease due to the organism 
He also “haga 's generally first noticeable at the margins of the leaves. 
Stchyma” of “eg eeu agua spreads rapidly in the loose cellular par- 
Finally, there j . Perales, which is not true of Pseudomonas campestris. 
enting with aoe a line as to what kind of an organism he was ae 
"3S at that 4 ubsequently Dr. Russell told me (November 1896) sate e 
White organism. (1895) working with the “ wrong germ,’ namely, ye a 
Publication . this probably explains why he withheld the paper rom 
Silence © «= 8° &Xplains why I preferred to pass over the abstract in 
beet ns what I have learned orally or by correspondence with Dr. 
nbs y a other people, concerning his “unpublished” work, so as to 
How | Snizant” of it. The whole thing can be put in a nutshell. 
€ to undertake the study of this organism is sufficiently set 
Sion is 
