i)2 

 Connecting forms among the tolyporoid fungi. By L. M. Underwood. 



Unused forest resoi rces. By Stanley Coulter. 



Distribution of certain forest trees. By Stanley Coulter. 



Cleistogamy in Polygonum. By Stanley Coulter. 



The Cactus flora of the southwest. By W. H. Evans. 



Diseases of the sugar beet root. By Katherine E. Golden, 

 In some analyses of sugar beets made at the Purdue Experimenting Sta- 

 tion by Prof. Houston, station chemist, the percentage of sugar was so low 

 that an investigation as to the cause was made. Upon a microscopic exam- 

 ination by Dr. Arthur, station botanist, the low per cent, roots were found 

 to have bacteria in them. After that the roots were observed closely, and 

 it was found that individual beets among all the varieties grown were af- 

 fected, to a greater or less extent, with this bacterial disease. 



The roots thus aflPected do not differ in outward appearance from the 

 healthy roots, but are much lighter in weight. The texture of a healthy 

 root is firm and somewhat brittle, and in color is a clear white, while the 

 diseased root is rather soft and tough and of a yellowish white color. If 

 the diseased root be cut transversely, concentric rings of brownish dots are 

 seen.* These rings are formed by the fibro- vascular bundles, the dots being 

 the separate bundles. The cells of the bundles have a deposition of yellow 

 coloring matter upon their walls, which becomes somewhat darker upon 

 exposure to air. 



•■■•Circles of dark dots are found in all sugar beet roots, but in the diseased roots they as- 

 sume a greater prominence, and thus are very effective in the determination of the disease. 



