314 
1885. ARTHUR, J. C. (Geneva, N. Y.) Proof that bacteria 
are the direct cause of the disease in trees known as pear 
blight.. Proc.. Amer... Assoc,. Adv) "Sti, “vole xnaaiy. 
1885, p. 295. [22 pages. | , 
Same in Bot. Gaz., vol. x, 1885, p. 348. [23 pages. } 
Same in Gard. Chron., vol. xxiv, 1885, p. 586. [12 
col, | uae 
"Abstract, with comments, by L. Forquignon, in Bul. 
Soc. Myc. de France, No. 3, 1886, p. 198. © [2 pages. ] 
The germs were cultivated in sterilized infusion of corn (maize) meal for 
nearly four months, during which there were six transfers, and then inocu- 
lated into green fruit of Bartlett pear, and the disease produced in full force. 
The juices of blighting tissues, from which the bacteria had been removed 
by filtering through porcelain, failed to start the disease when introduced 
into green fruit. Both experiments were duplicated. The conclusion is. 
that the bacteria are ‘‘the direct cause of the disease.” 
1885. ARTHUR, J. C. (Geneva, N. Y.) Report of the bot- 
anist. Rep. N. Y. Agric Exper. Station for 1885, p. 241. 
[7+ pages on blight. | | 
Brief abstract in Bul. Soc. Myc. de France, No. 3, 
1886, p. 196. [2 page. | 
1885. ArTHuR, J. C. (Geneva, N. Y ), and others. Pear 
blight | with discussion]. Proc. Am. Pom. Soc. for 1885, 
p. 44. [74 col.] 
Same in. Rep. Mich. Hort. Soc. for 1885, p. 173. [44 
pages. | 
Same in Mich. Hort., vol. 1, 1886, pp. 222, 287. [53 
col. | 
Nearly complete in Rep. Ohio Hort. Soc. for 1885-6, 
p. 154. [2 pages. ] 
Partial report in Orchard and Garden for Dec., 1885, 
Dy ooxt ie Cale | 
Resumé, in part, by E. F. Smith in Mich. Hort., 
vol. 1, 1885, p. 34. [24 col.] 
The same ground is covered as in the American Naturalist. E. Moody 
(Lockport, N. Y.) said that he, having ‘‘ whitewashed with lime and sul- 
phur, has had no blight for five years.” Several persons asked questions. 
that were answered by Mr. Arthur. . 
1885. ARTHUR, J. C. (Geneva, N. Y.) Pear blight and its 
cause. Amer, Nat., vol. x1x, 1885, p. 1177. [81 pages. ] 
The disease and its effects are described, as also the appearance, size and 
motions of the bacteria, and the chemical changes they induce. The course 
of the investigation by means of inoculations and cultures is gone over, and — 
finally the proof is given that the bacteria associated with the diseas cause it. 
