912 The American Naturalist. [November, 
suspended in the streams passing over and through marshes, 
swamps, bogs and deltas, and are so divested of any destruc- 
tive power upon bone. And in any case, the elaboration of 
these acid products which we are considering would be partial 
or completely suspended at such depths as are usually given 
for the repositories of vertebrate remains. Yet, however di- 
verted or minimized may be the action of organic acids and 
carbonated water upon bone, there can be little doubt that it 
is considerable, and an important means in many cases of im- 
parting to them much fragility or of entirely disintegrating 
them. 
(To be Continued.) 
THE BACTERIAL DISEASES OF PLANTS: 
A CRITICAL REVIEW OF THE PRESENT STATE OF 
OUR KNOWLEDGE. 
By Erwin F. SMITH. 
(Continued from p. 804) 
IV. 
IJ. THE HYACINTH (HYACINTHUS ORIENTALIS). 
(II) Tue ORGANISM: Bacillus hyacintht (Wakk.) Trev. ore 
1. Pathogene 
(A) vse 
(B) Yes (?). The poured plate method was not then in 
general use. Inoculations were made directly from 
diseased plants into sterile nutrient fluids, or into tubes 
of nutrient gelatin, and the resulting cultures may not 
always have been pure ones, although the writer’s own 
` experience has shown conclusively, in. case of melon 
- wilt—a somewhat similar disease—that it is often pos- 
sible to obtain pure cultures in this way, if the culture 
