870 EXPERIMENT STATION RECORD. 



and that from a tree 50 years old 1 post 10 ft. long and 1 post G ft. long could 

 be obtained. The data for red oak showed an average diameter of 3.5 in. and 

 ;i height of 3G ft. at 20 yens of age and a diameter of 10.4 in. and a height of 

 70 ft. ar 00 years of age. 



In the ease of chestnut sprouts it was found that a pole 30 ft. long and in. 

 in diameter could be grown in the open in 30 years and in the forest in 40 years. 

 It is thought probable that in 50 years 100 to 150 trees per acre at least 13.7 

 in. in diameter at breast height could be produced. If 125 trees straight enough 

 for poles could he secured in 50 years a stumpage value in poles alone of .$125 

 would be attained. The tallies given show the rate of growth of chestnut 

 sprouts in New Haven. Conn., and at Milford, Pike Co., Pa. 



On the rate of growth of birch in the mountain regions of Jamtland, 

 Sweden, C. Andersson (Skogsvardsfor, Tidskr., 3 (190.1), No. 11, pp. >,1l-',22).— 

 Determinations in 3 different districts at altitudes ranging from 000 to Too 

 in. showed that the average increase in diameter per year for birch was 1.45, 

 2.45. and 3.05 mm. Fuel wood of 15 to 20 cm. diameter will accordingly 

 require the following periods for full growth : 50 to 65, 60 to 80, and 100 to 

 140 years tor the different districts, respectively. — f. w. won, 



Instructions for making forest maps and surveys, G. Pinchot (77. 8. Drpt. 

 Agr., Forest Serv. [Circ.], Oct. ~>. 1905, pp. 10). — Directions for the use of vari- 

 ous surveying and map-making instruments and of different colored pencils 

 and signs which are to be used in the Forestry Service to secure uniformity in 

 map work. 



Report of the lecturer in forestry, E. J. Zavitz (Ann. Rpt. Ontario Agr. Col. 

 anil Expt. Farm, 31 ( 1905 ), pp. 222-227, figs. 6). — A general outline of the work 

 of the year, with a list of the various species of trees growing in the college 

 plantation and nursery. 



Forest belts of western Kansas and Nebraska, R. S. Kellogg ( 77. 8. Dept. 

 Agr., Forest Serv. Bui. 66, pp. -'/.'/. pis. 6, map 1). — A study was made of the 

 forests of western Kansas and Nebraska and eastern Colorado, included between 

 the ninety-ninth and one hundred and fourth meridian, and the northern bound- 

 ary of Nebraska and southern boundary of Kansas and Colorado. This area 

 includes about 109,000 square miles. The physical conditions of the country 

 are first noted, followed by a discussion of the natural forest types of the 

 region. 



In Kansas and Nebraska the natural forest growth is limited to the river 

 courses and a few upland areas of pine and cedar. The pine type is chiefly 

 prominent in northwestern Nebraska, while the valley type is the common forest 

 type of the river courses in Kansas and Nebraska. While the pine type is of 

 the greater economical importance, the valley or broadleaf type is of interest 

 to a much larger number of people. Most of the pine forests of value have 

 been cut away and destroyed. 



A study was made of the reproduction of rock pine. In one instance, out of 

 a total of 1,509 seed Leathered from fallen cones, only 20 were good, and out 

 of 2,253 seed from green rones only 1 in 7 was good. The chief cause of the 

 defectiveness in these cases appeared to be in the failure of the seed to develop. 



Tables are given showing the rate of growth of young rock pine in different 

 counties of Nebraska. Red cedar has been quite completely cut out, but where 

 such trees exist the reproduction is generally good and much larger than that 

 of pine. The principal enemies to tree production are stock, fires, and to some 

 extent the tip borer of pine. 



The prevailing species of timber along the river courses are white elm, hack- 

 berry, red mulberry, green ash, box elder, cottonwood, and almond-leaf willow. 

 The number of these trees on various sample areas in different counties of 



