DISEASES OF PLANTS. 653 



is estimated at 126,447 square kilometer8. The rainfall and climate are discussed, 

 the forests described, the relative value of the woody species indicated, and methods 

 of management described. 



Mixed forests of pine, fir, and larch., Eeiss (Allg. Forst u. Jcujd Ztg., 76 {1900), 

 June, pp. 189-192). — The requirements of each species are described, their value as 

 components of mixed forests mentioned, and methods suggested for securing such 

 mixtures. 



On the growth of oak and other deciduous species in beech forests, H. 

 Bertog {Ztschr. FoM n. Jagdiv., S3 {WOO), Xo. 4, pp. 188-212, figs. 10). — Notes on the 

 requirements and growth of various species of oak, ash, maple, etc., growing in beech 

 forests. 



Comparative ash analyses of red fir and European spruce, E. Hoppe {Ccnthl. 

 Gesam. Forstw. Wien, 26 {1900), No. 2, ptp- 49-54). — Comparative ash analyses of 

 Psendot^uga donglasi and European spruce are given. 



Physiolog'ical investig-ations on the increase in diameter and the quality 

 of the timber of Pinus sylvestris, F. Schwarz {Physlologisclie Vatersuchuugcii iiber 

 Dickenwachstum und Holzqualitat von Pinus .sylvestris. Berlin: P. Parey, 1899, pp. 371, 

 ph. 9, figs. 5; noted in Allg. Forst v. Jagd Ztg., 76 {1900), Mar., pp. 106-110). 



On the estimation of the yield of oak forests, Wimmenauer {Allg. Forst u. Jagd 

 Ztg., 76 {1900), Jan., j^p. 2-9). — Tables are given for estimating the yield of oak for- 

 ests. The characteristics of the various forests where the tables have been tested are 

 given. Qnercus pendunculatu and Q. sessiliflora were the dominant species, with beech, 

 ash, alder, linden, elm, and several conifers forming the secondary growth. 



Rapid estimation of the cubic contents of fir trees {Rev. Fau.v et Forcts, 3. ser., 

 4 [1900), Xii. 1, jip. 17-21). — Formulas are given f(_)r the estimation of the contents of 

 workable timber in fir trees. It is leased ujion the rule that the cubic contents of a fir 

 tree 24 meters in height equals 10 times the square of the diameter of the tree at the 

 height of a man. 



An international commission on timber physics, Schwappach {Ztschr. Forst u. 

 Jagdu-., 32 {1900), No. 4, pp. 230-233). — An account is given of previous attempts in 

 the formation of such an international commission for securing uniformity of methods. 



The influence of forests upon the temperature of the air, Mcttricii {Ztsrhr. 

 Forst It. Jagdu:., 32 {1900), No. 3, pp. 147-167). — Gives records made at periods of 2 

 hours daily for 3 years in which the temperature of a forest and an open field are 

 compared. 



Pasturing- forests, A. Mathey {Le pasturage en foret. Dijon, 1900; rev. in Bev. 

 Faux et Forets, 3. ser., 4 {1900), No. 5, pp. 156-1.58). — The results of the author's 

 personal observations upon the effect of pasturing ff)rests. 



Annual review of the literature of forestry, T. Lorey {Allg. Forst n. Jagd Ztg., 

 76 {1900), Sup., pip. 1-98). — Briefly reviews the forest literature relating to forest 

 botany, zoology, etc. 



DISEASES OF PLANTS. 



The fungus infestation of agricultural soils in the United States, 



E. F. Smith {Pr<>c. Arnt>\ Aasoc. Adc. Sci, J^S (1880), jk MJ).— The 

 results of the author's studies on parasitic Fusariums, as shown by his 

 completed experiments on soil infections with the watermelon fungus, 

 are given. It is shown that related species of Fusariums prove equally 

 destructive to other plants, such as cabbage, tomato, sweet potato, etc. 

 It is also shown that these fungi live in the soil over winter and attack 

 the plant from the earth. A soil once infected with anv of these 



