990 



SCIENCE 



[N. S. Vol. XXVII. No. 704 



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 dis- 

 ease is the sclerotium and that each season's 

 infection is by wind-borne ascospores produced 

 from these sclerotia. They recommend 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 

 exhaustion 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 Featv/res 

 along the Band-hills Border of the Atlantic 

 Coastal Plain: Collier Cobb, of the Uni- 

 versity of North Carolina. (No abstract 

 furnished.) 



Notes on the Life Zones in North Carolina: 



C. S. Brimley and Franklin Sherman, Jr., 



of Ealeigh, N. C. 



The authors, having made a detailed 

 study of all available records of the occur- 

 rence and distribution of animals in the state, 

 present their conclusions as to the probable 

 boundaries of the different life zones. The 

 groups of animals chiefly relied upon are 

 mammals, reptiles and batrachians. Birds 

 and insects have been used mainly to confirm 

 ideas otherwise originated. 



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 following places are 

 placed in this zone: Black Mountain, Eoan 

 Mountain, Grandfather Mountain, Bald Moun- 

 tain in Yancey County, and the higher moun- 

 tains in Macon County near Highlands. 



2. The Alleghenian Zone includes practi- 

 cally all between the elevations of 2,500 feet 

 and 4,500 feet. This includes most of the 

 Blue Ridge, Smoky Mountains, ISTantahala 

 Mountains, Balsams, Pisgah Eidge, and the 

 lower elevations of Black Mountain and 

 others mentioned as belonging to the Cana- 

 dian zone. 



3. The Upper Austral Zone includes all of 



the state north and west of a line drawn from 

 Suffolk, Va., to Ealeigh, thence to Charlotte, 

 thence to the South Carolina line near Tryon 

 in Polk County; except that portion already 

 assigned to the Canadian and Alleghenian 

 zones. 



4. The Lower Austral Zone includes all of 

 the state to the south and east of the line just 

 mentioned. 



Lists are given of the characteristic animals 

 known in each of these zones, and mention is 

 made of a number of exceptional records, 

 where animals have been taken beyond the 

 limits of what their range would supposedly 

 be. 



The counties in the extreme northwest part 

 of the state have not yet been zoologically 

 explored, and are therefore not yet assigned 

 to any zone, awaiting the accumulation of 

 more records. 



The Relation of Bovine Tuierculosis to the 

 Public Health: Tait Butler, of the Depart- 

 ment of Agriculture, Ealeigh. (No ab- 

 stract furnished.) 



The Twenty-seven Lines upon a Cuhic Sur- 

 face: Archibald Henderson, of the Uni- 

 versity of North Carolina. 

 In his paper Dr. Henderson explains that 

 by the selection of a highly symmetrical equa- 

 tion of a cubic surface: 





+ r + 





a- 



by a proper choice of constants x^, y^, z^, w^; 

 ^v Vv ^2, w.; and finally by employing a 

 regular tetrahedron as tetrahedron of refer- 

 ence, that it was not difficult to derive very 

 simple and symmetrical equations of the 

 twenty-seven lines upon the cubic surface, 

 and therefore to construct a string model of 

 the configuration, showing the fundamental 

 tetrahedron and the twenty-seven lines in 

 proper relation to each other and to the fun- 

 damental tetrahedron. Instead of a string or 

 wire model, he exhibited a beautiful per- 

 spective drawing in colors of the configura- 

 tion. 



