48 Journal of the Mitchell Society [Jane 
Concerning Sclerotinose of Lettuce, F. L. Stevens and J. G. Hall, 
of the N. C. Experiment Station, Raleigh. 
The term Sclerotinose was proposed as a designation for diseases 
caused by Sclerotinia , and Sclerotinose of lettuce was characterized 
as one form of lettuce drop caused by S. Lihertiana. 
As the result of two years'' study the authors conclude that the 
only part of the fungus that lives through the quiescent period of 
the disease is the sclerotium and that each season's infection is by 
wind borne ascospores produced from these sclerotia. They rec- 
ommend that the formation of sclerotia be prevented by early 
removal and destruction (incineration or burial) of infected plants. 
This course followed for a few years, accompanied by the exhaus- 
tion of all sclerotia originally in the soils by germination, seems 
promising as a means of ridding infected regions of the pest. 
The Origin of Certain Topographic Features along the Sand-Hills 
Border of the Atlantic Coastal Plain. Collier Cobb, of the 
University of North Carolina. 
Notes on the Life-zones in North Carolina.* By C. S. Brimley and 
Franklin Sherman, Jr., Raleigh, N. C. 
The authors, having made a careful detailed study of all avail- 
able records of the occurrence and distribution of animals in the 
state, present their conclusions as to the probable boundaries of 
the different life-zones. The groups of animals chieffy relied 
upon are: Mammals, Reptiles, and Batrachians. Birds and 
insects have been used mainly to confirm ideas otherwise origi- 
nated. 
It is found that four distinct life-zones are represented in the 
state as follows: 
1. The Canadian Zone, including only the tops of the 
higher mountains, usually above 4,500 feet elevation. The fol- 
lowing places are placed in this zone: Black Mountains, Roan 
Mountain, Grandfather Mountain, Bald Mountain in Yancey 
County, and the higher mountains in Macon County near High- 
lands. 
♦This paper was published in full in this Journal, for May, 1908. 
