No. 2, November, 1920] FORESTRY 75 



ing. By lax met hods checks arc made w liicli do not show t he i rue state of affairs. Of I hree 

 methods possible, thai of the average deviation appears to offer the greatesl possibiliti 

 Two tests should be made of every volume (able, a comparison of the true volume against 

 the table volume, and a computation <>f the average deviation of the individual volume-' from 

 it. With these tests prepared for each table it should be possible to determine the aecuracy 

 of the table for use in any region or for any set of trees by the degree to which I hey fit. — 

 E. N. Maims. 



536. Buy ant, H. B. A suggested general forest organization for the Madras Presidency. 

 Indian Forester 46: 205-212. 1 fig. 1920. — It is proposed to organize the work under the 

 four branches: Working Plans, Exploitation, Clerical and Educational. The functions of 

 each branch and its organization are depicted. — E. N. Manns. 



537. Cape, John. The measurement of timber. Trans. Roy. Scot. Arbor. Soc. 33: 127- 

 138. 1919.— The author points out the inaccuracy of the "quarter girth system" of measuring 

 timber, which has become so universally used in the British Isles, discusses other systems of 

 measurement and finally proposes for use the formula 1/2 (D 2 ) L. The amount of manu- 

 factured material produced from a log is taken as equal to a square log, having as its section 

 an area equal to the square inscribed in the mean sectional area of the log. — C. R. Tillotson. 



538. Carhart, A. H. Recreation in the forests. Amer. Forestry 26: 268-272. 10 fig. 

 1920. 



539. Gary, Austin. Reflections. Jour. Forestry 18: 472-476. 1920.— The professional 

 forester has laid himself open to criticism because he has not purchased and put into operation 

 on his own lands what he has been preaching as good for the lumberman. — E. N. Munns. 



540. Claughton-Wallin, H., and F. McVicker. The Jonson "absolute form quotient" 

 as an expression of taper. Jour. Forestry 18: 346-357. 1920. — Investigations to determine 

 the extent to which the Jonson "absolute form quotient" agrees with American timber shows 

 that it is of great value in reducing the number of field measurements necessary to prepare 

 an ordinary volume table. Tried out on small eastern pines and spruce the results were 

 surprisingly good and even in the large timber of the American northwest, the theory is of 

 great value. For large timbers the root swelling interfered to a considerable extent, but 

 below 12 inches breast high root swelling is a negligible factor. Form class is hard to deter- 

 mine, but density appears to be an excellent criterion of the average form of trees in even-aged 

 stands, and a relation between density and form class can be established.- — E. N. Munns. 



541. Dallimore, W. Elms and elm timber. Quart. Jour. Forest. 14: 109-118. 1920. — 

 This article discusses the difficulties attending the sale of elm timber by owners in the Brit- 

 ish Isles, attributes it to the failure of both grower and timber merchant to recognize and keep 

 separate the several different kinds of elm. Discusses the characteristics of the elms of 

 Britain. — C. R. Tillotson. 



542. Deb, Sasi Mohan. Tea box industry in Upper Assam. Indian Forester 46: 304-307. 

 1920. — A list of the woods in order of their value for tea boxes is given and their method of 

 manufacture is described. — E. N. Munns. 



543. Eberhard. Was will der Abriicksaumschlag (Keilsaumbetrieb)? [Wedge strip 

 cuttings.] Forstwiss. Centralbl. 41: 441-448. 1919. — With most silvicultural systems that 

 depend upon natural reproduction, considerable damage is done to young growth by the 

 removal of the older trees. This is particularly true where, as in most cases, successive cut- 

 tings proceed away from roads and upward on slopes. Under the system here proposed cutting 

 begins half way between main roads, in level country, and proceeds toward the roads, so that 

 logs are not dragged over young growth. On slopes, cutting strips lie up and down the slope. 

 The system involves a preparatory stage, with frequent light thinnings in the upper crown 



