6o4 forestry Quarterly. 



should be acquainted, and on which methods of preservation are 

 based. In order to prevent decay caused by Lenzites the follow- 

 ing advice is given: (i) cutting during late summer, fall and 

 winter; (2) floating of timber; (3) good drainage of ground on 

 which the wood is used; (4) rapid seasoning followed by painting 

 with preservative substances; (5) the use of composite timbers 

 instead of single large ones. But the most effective way is by 

 treatment with solution of chemicals of which creosote is the best. 

 The collection and burning of the decayed wood is also advisable. 

 An exhaustive bibliography is appended. 



J. H. F. 



A Biologic and Taxonomic Study of the Genus Gymnospor- 

 angium. By F. D. Kern. Bulletin 26, New York Botanical 

 Garden, Volume VII, 191 1. Pp. 392-494. 



Part I deals briefly with problems of distribution, culture 

 methods, life histories and pathological phenomena. The attacks 

 of these fungi on apple, pear, and quince trees are sometimes so 

 severe as to cause considerable damage. Orchardists have tried 

 spraying, but with very indififerent results. The conifers affected 

 belong exclusively to the genera Juniperus, Chamaecyparis, 

 Lihocedrus and Cupressus. Part II is an important contribution 

 to the taxonomy of the genus, successfully attempting as it does 

 "to present a systematic treatment of all the species known to 

 occur in any part of the world." Forty species in all are de- 

 scribed. Complete analytic keys and an extensive bibliography 

 constitute a valuable part of the paper. 



J. H. F. 



Volatilisation of Various Fractions of Creosote after their 

 Injection into Wood. By C. H. Teesdale. Circular 188, U. S. 

 Forest Service, Forest Products Laboratory Series. Washington, 

 D. C. 191 1. Pp.5. 



In this experiment, forty-eight specimens of sap loblolly pine 

 were treated with five fractions of creosote obtained by redistil- 

 ling a good commercial grade of coal-tar creosote. Weekly 

 weighings determined the volatilization, other experiments show- 

 ing that the loss in weight was not related to the moisture con- 



