174 Forestry Qiiarterly 



silviculture, his Lehrbuch der forstlichen Bodenktinde U7id Klima- 

 tologie is still a classic, and so is his illustrious father's, Karl 

 Heyer, Waldbau (silviculture), of which the son published several 

 enlarged editions. 



Dr. Hess, successor to the Heyers, father and son, in the pro- 

 fessorship at Giessen, prepared a later edition (1893) of this 

 great work, piously preserving Karl Heyer's spirit, and refers to 

 it as "surely a rare case, for only too often would a successor 

 tear down what his predecessor has built." 



Gustav Heyer. Allgemeiue Forsl- u. Jag.lzeitung, Jan., 1906, pp. 1-5. 



New regulations regarding requirements 

 Reguir€me?its for acceptance into the forest service in 

 for the Prussian department, are stricter than 



Forest Service before in demanding perfect eye sight, 

 ruling out spectacles, and laying down 

 specific rules. The right eye must be entirely free from faults, 

 the left eye must have at least three quarters of normal sight. 

 Shortsightedness of the left eye when the distance difference is 

 28 inch or less, excludes from acceptance. Another require- 

 ment accentuates the need of full mathematical knowledge. 



MISCELL.^NEOUS. 



The raising of sunken or " deadhead" logs 

 Raising from the bottoms of streams in Michigan 



Sunke?i and Wisconsin is becoming a recognized 



logs and profitable practice. At present it is 



being carried on extensively on the Manis- 

 tee and Menominee rivers with considerable success ; due to the 

 fact that these rivers were used for driving enormous quantities 

 of logs. It is usually estimated that in driving logs 5-10% 

 become deadheads. Reckoning 5% of the total 3,750,000,000 

 feet of logs which have been driven on the Manistee, there 

 would be a total of nearly 200,000,000 feet of logs to be raised. 

 Most of these logs are of the larger and better classes, making 

 a powerful incentive to raise and convert them into lumber. 



The logs are raised by means of large scows which are 

 equipped with steam derricks and drums. The recovered 

 logs are piled on skidways along the bank and will be 

 driven to the mill as soon as dry enough to float. 



Mining for Timber in the Beds of Northern, Streams. American 

 Lumberman, March 17, 1906, pp. 27-28. 



