No. 1, November, 1921] FORESTRY 9 



that in those years and months in which the average vapor pressure remained high a very 

 small nmnber of fires occurred, while in those years and months with a relatively low average 

 vapor pressure there were uniformly periods of extreme hazard, during which many bad fires 

 occurred. — E. N. Munns. 



61. Olmsted, Fredekick E. National control of forest devastation. Jour. Forest. 

 19: 468—478. 1921. — The text of the new Capper Bill is given in full with an analysis of the 

 sections and how the bill would act to control the devastation now caused by the lumber 

 industry. — E. N. Munns. 



62. RoiG, J. T. Legislacion forestal y reservas forestales. Necesidad de una legislaci6n 

 forestal. [Forestry legislation and forest reserves,] Rev. Agric. Com. y Trab. [Cuba] 3: 

 3GG-3G9. 1920. 



63. Salt, Harold. A tanning survey of the west. Australian Forest. Jour. 4: 117-118. 

 1921. — A note is presented on the sources of supply and the possibilities of a tanning survey 

 in studying the tannin contents of all parts of a tree. — C. F. Korstian. 



64. Salt, Harold, Forestry and the manufacture of tanning extracts. Australian Forest. 

 Jour, 4: 118-119, 1921. — The note concerns the relation of forestry to stability in the manu- 

 facture of tanning extracts. — C. F. Korstian. 



65. Smythies, E. a., and S. H. Howard. Taper curves and constants for sal. Indian 

 Forest. 47: 161-164. 2 fig. 1921. — The taper factor for sal has been found to be a constant 

 for all diameter classes and that for trees from 3 feet 6 inches to 6 feet 6 inches in girth the 

 ratio 



Breast high diameter over bark 



Diameter at x without bark 



= a constant 



where x is any chosen height on the stem above breast height. From these points a curve 

 may be constructed giving the taper constant which holds very close to the actual. This 

 method may be used to determine the diameter at half height for use in volume calculations. — 

 E. N. Munns. 



66. Snell, Walter H. The relation of the moisture content of wood to its decay. Paper 

 Trade Jour. 72'^: 44-46. 2 fig. 1921. — The author contributes to the discussion of the feasi- 

 bility of spraying log piles for the prevention of fire, emphasizing the effect of this spraying 

 upon decay. Muench's data are cited as well as experiments of the writer upon 5 fungi. 

 It is shown that the moisture-decay curve varies inversely with the specific gravity of the 

 wood. Sixty per cent of water (150 per cent calculated upon oven dry weight) prevented 

 decay in loblolly pine sap and 67 per cent (200 per cent on oven dry weight) in Sitka spruce. 

 Inasmuch as it has previously been shown that logs sprayed a short time contained 52-60 

 per cent of water, and as the pulp logs are of about the same density as the loblolly pine sap, 

 it is concluded that spraying for fire protection carries with it no danger of favoring serious 

 loss through decay. — W. H. Snell. 



67. Staf, H. Eikenhakhout. [Oak coppice.] Tijdschr. Nederland. Heidemaatschap- 

 pij 33:215-218. 1921. — High prices for bark and the demand for fuel led to extensive' 

 planting of oak, especially on the heaths of the Velurve. Bark prices are given for the 

 period 1874-1920. Plantations on lowlands are liable to injury by late spring frosts, andi 

 mildew frequently causes some loss. Oak can be followed by pine forests. — /. C. Th. Uphof], 



68. Staf, H. Het dunnen van dennenbosschen, [Thinning of pine forests.] Tjjdschr. 

 Nederland. Heidemaatschappij 33: 158-100. 1921. 



69. Stoate, T. N. Sylvicultural notes: Pinus insignis, Australian Forest, Jour, 3: 

 275-277, 325-327. 1920; 4: 9-11, 37-39, 106-107, 1921,— A silvicultural discussion is presented 

 summarizing the information available on soil and climatic requirements, the establishment 



