Periodical Literature 629 



Teredo, the damage being especially severe during August, 1913. 



The borer enters the log, from its stage as a free swimming fry, 

 by a minute hole and bores its way into the wood, quickly enlarging 

 the size of the bore until it measures about }i inch in diameter. 

 At this stage the borers do not exceed 10 inches in length. The 

 borers do the greatest damage when the river currents are sluggish 

 and the tides high. Both new and old timber is attacked, also 

 barked and unbar ked logs. 



It is stated that no antiseptic treatment yet discovered can be 

 recommended as an effective preventive. 



Damage is said to be greatest in the vicinity of mangrove trees, 

 which also are severally attacked, and it is recommended that 

 logs should be hauled out of the water if possible, and in any case 

 they should not be tied up near mangrove trees. 



Bulletin of Miscellaneous Information, Royal Botanic Gardens, Kew. No. 

 2, 1913, pp. 72-75. 



MENSURATION, FINANCE AND MANAGEMENT 



Fritz Lauterbach of Battweiler has con- 



Universal structed a simple universal dendrometer (to 



Dendrometer be had from Eckstein-Eisenach) for which 



or Polymeter he claims that for easy handling, rapidity 



and accuracy it excels all existing ones. 



It measures horizontal angles to 2 accuracy, can be used for 



topography in degrees or per cent, with or without support on 



tripod, staff or pendulum; for height measuring with or without 



base line. From the illustration we would judge that it was not 



quite so simple as desirable. 



Ein neues Universalinstrument. Forstwissenschaftliches Centralblatt, July, 

 1914, pp. 395-6. 



A startling and, if fully substantiated, 

 One Only most important and far-reaching discovery 



Yield Table is announced by Oberforstmeister Fricke, 



namely, that one yield table probably 

 suffices for each species, if properly constructed, applicable wher- 

 ever the species grows. 



He comes to this conclusion by comparing yield tables of Scotch 

 pine from Russia, Sweden and various regions of Germany, 



