1020] FORESTRY. 149 



oil oxpcriiMifo .iriilhcrcfl diirini,' llio ormuiizalion mikI lift' of the above com- 

 pany rcljitivf* to iiii|iortiint factors S"v<'niiii{; successful t iiiihcrlaMd insurance, 

 and fiivcs a sample of the form us(m1 in applying for tin>l)erlan(l insurance. 



The Jonson " absolute form quotient " as an expression of taper, IT. 

 < "i.AUtiirroN-WAixiN and F. McVickek (.lour. Forestry, 18 {l!)20). No. 4, pp. .l/fH- 

 ■ :''l'). — The authors pre.sent datii secured from investigations conducte<l in 

 Ontario and in British Columbia with several different timber species to de- 

 termine the value of the Jouson " alisolute form quotient" (E. S. II., 39, p. 

 -47) as an expression of taper in Canadian trees. 



(Jeneraliy si)eaking, bettei* resiilts have been secured witli Jonson's method 

 in Ontario than in Britisli Columbia, where root swelling and barli of very 

 varying tliickness in tlie virgin forests has influenced tlie results. Nevertlie- 

 less, it is l)elieved tliat the theoiy is of great value, even in the big timber, in 

 re<lucing the number of field measurem>euts required to prepare an ordinary 

 volume tal)le. 



The forests of Quebec, G. C. PiCHfi (Jour. Engin. Inst. Canada, 3 (W20), 

 No. 5. pp. 229-2.iS). — A statistical accoimt of the forests of Quebec with refer- 

 ence to their area, classiticatitm, administration, activities in reforestation, 

 lumber industries, etc., including a discussion of future forest development iu 

 tlie I'rovince. 



Tlie management of second growth white pine in central New England, 

 K. T. Fisher and E. I. Terry (Jour. Forestry, 18 (19^0), No. 4, pp. 358, 366).— 

 A summary of conclusions based upon an extended study of the management of 

 the white pine forest type In central INIassachusetts and southern New Hamp- 

 shire. 



The hardwoods of Australia and their economics, R. T. Baker {N. .<?. 

 Moles, Tcrhnol. Muh., Tech. Ed. ^er. No. 23, 1019, pp. Xri+522. pU. 7//, ficis. 

 198). — A contribution from the Technological Museum, New South Wales, com- 

 prising a manual of information relative to the hardwoods of Australia and 

 their use. Part 1 treats, in general, of the type.s of hardness and various 

 idiysical properties of timber and contains classifications of the principal hard- 

 woods, with reference both to the color and comparative combustibility of the 

 timbers. In part 2, the individual species are descril)ed in botanical sequence. 

 I'nder each si)ecies is given the description, uses, and anatomical features of 

 the timber, together with a systematic descriptifm and geographical range of 

 the species. For the more important species, photograi)hic illustrations are 

 given of cross, radial, and tangential wood sections, t<»gether with illustrations 

 of the wood in natural colors. Part 3 contains technical articles dealing with 

 the determination of specific timbers, nomenclature, seasoning, and preserva- 

 tion of timber, together with an account of the various architectural, engineer- 

 ing, and miscellaneous uses of Australian hardwoods. 



The improvement of West African rubbers, C. Van Pelt (/».s/. Colon. 

 Marseille, liiil. Cttoutchoum, No. 1 {1920), pp. 58). — This report embraces the 

 results of a mission to French Guiana and the Ivory Coast, conducted with the 

 view of determining methods of improving the rubber industries of those 

 countries. 



Vegetation of Philippine Mountains, the relation between the en,viron- 

 nient and physical types at different altitudes, W. H. Brown {[Philippinr] 

 Bur. Sri., liipt. Ayr. and Nat. Resources, I'lih. 13 (1919), pp. 434, pis. 41, fif/s. 

 SO). — A contribution from the Bureau of Science of the Philippine Department 

 of Agriculture and Natural Besf)urces. 



The pai>er contains a general discussion of plant formations occurring at 

 different levels on the eastern slope of Mount Maquiling, Luzon, with detailed 



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