188 BOTANICAL GAZETTE [SEPTEMBER 
Cuares E. Bessey: Report upon the progress of the botanica 
survey of Nebraska— The survey was organized in 1892 by the 
Botanical Seminar of the University of Nebraska, since which 
time it has brought together more than 10,000 specimens; pub- 
lished ‘Reports I, II, III, and IV;” and published Parts I, I, 
and XXI of the Flora of Nebraska. The total number of species 
known to the state is about 3400. 
ALBERT F. Woops: Bacteriosis of carnations —This disease 
is not due to a bacterial disease, as has been supposed, but to the 
punctures of aphides and thrips. The cells affected become 
cedemic, collapse, and give a whitish sunken spot. The dead 
tissue may subsequently become infested by bacteria and fungi. 
(Published in full in this number.) 
Erwin F. Smita: Wakker’s hyacinth bacterium.— Diseased 
bulbs were procured in 1896 from the Netherlands, and the whole 
subject has been re-examined. The micro-organism described 
by Dr. Wakker in 1883 as Bacterium hyacinth is the true cause 
of the disease, and is quite unlike that subsequently isolated from 
rotting hyacinth and described by Dr. Heinz as Bacillus hyacintht 
septict. Successful inoculations have been obtained from pure 
cultures, and much new information has been gathered respect- 
ing the relationships of the organism and its behavior in a variety 
of culture media. 
Cuartes E. Bessey: Are the trees receding from the Nebraska 
plains 2— None are known to be receding, while several species, 
such as the bur oak and the pines are advancing. 
C. A. Peters: Reproductive organs and embryology of Drosera. 
—A detailed account of the structure and development of pollen 
and ovule, the former differing in some particulars from that of 
most dicotyledons. 
J. O. ScHLorreRBECK: Development of some seed coats—The 
appendage to the seed of Melampyrum pratense is not a strophiole, 
nor a caruncle, nor an arillus, each of which has been claimed, 
but is a part of the endosperm which becomes constricted off 
from the rest during development. A study of the development of 
the seed of Croton Tighium shows that its nucellus protrudes far 
