34 The American Naturalist. [January, 
THE BACTERIAL DISEASES OF PLANTS: 
A CRITICAL REVIEW OF THE PRESENT STATE OF 
OUR KNOWLEDGE. 
By Erwin F. SMITH. 
(Continued from Vol. XXX, p. 924.) 
My 
II. THE HYACINTH (HYACINTHUS ORIENTALIS L)). 
2. THE BACTERIOSIS OF HYACINTHS (1889). 
(I) THE DISEASE: 
(1) Author, Title of Paper, Place of Publication, ete.—This dis- — 
ease was described by Dr. A. Heinz, Director of the Botanical- 
Physiological Institut in Agram. His paper (85) Zur Kentniss | 
der Rotzkrankheiten der Pflanzen was published in Centralblatt — 
J. Bakt. u. Parasitenkunde, Bd. V, No. 16, 12 April, 1889, pp. 
535-539. ‘a 
(2) Geographical Distribution—The disease was discovered in 
some potted hyacinths received from a florist in Agram. There 
is no statement respecting its occurrence in the field or in hot- 
houses. : 
(3) Symptoms.—All of the potted plants developed equally 
well until blossoming time, the last of January. Then visible — 
differences appeared, although the plants were exposed to the — 
same external conditions. Some of the plants continued their — 
normal development, unfolded their blossoms in regular order, © 
and remained entirely sound. Others were delayed in their 
development, and several circumstances indicated the presence — 
of a disease before there were unmistakable symptoms. These — 
symptoms soon appeared. The tips of the leaves yellowed, 3 
shriveled, and dried out for a distance of some centimeters — 
The blossoms either fell off before unfolding or opened in ir- 
regular order, and fell off soon after. Finally, in all the dis- 
eased specimens a progressive rotting was detected. This first 
attacked the axes of inflorescence, and then the leaves and bulb 
