496 forestry Quarterly. 



In a most enthusiastic and, with 20 pages, 



Nezv most complete article does Oberforster Dr. 



Increment Heck introduce the reader to a perfected 



Borer. increment borer and to the incalculable 



value of self -instruction by the persistent 



use of such borer, reviving Pfeil's noted advice, "Ask the trees !" 



As is well known Pressler was the originator of the brilliant 



idea of the increment borer, but the instrument left much to be 



wished for. An improvement was made by Bretschneider, 



especially in the handle, but the perfect borer is made in Sweden 



by Mattson, and the most perfect type of this only since August, 



1910, as a result of Heck's suggestions. 



The superiority of the Mattson over the Bretschneider was 

 shown by trial as follows : 



Originally, different borers for hard and for soft woods were 

 necessary and especially the former got often into trouble ; the 

 new type, Alattson's No. 3 works perfectly in both soft and hard 

 woods, a faultless tool, and the only improvement the writer can 

 think of is some electric power to do the boring. Yet, with this 

 instrument the. writer could extract 25 cyHnders from 40 year old 

 spruce 4 to 5 inch long in 57 minutes ; in hardwoods, to be sure, 

 the effort is much greater, three to four minutes being required 

 for the hardest. 



The instrument is extremely practically arranged, works rapidly 

 and surely, makes beautiful cylinders, much better than Bret- 

 schneider's, and long, and so smooth that only in few cases a 

 magnifying glass is required. 



There are four types made by And. Mattson, Mora, Sweden, 

 varying merely in length of bore by two inches from 4 to 10 inch, 

 and for use in hardwoods (as well as soft woods) being of harder 

 steel the prices run from $3.50 to $8.50. 



Merely to show what interesting data as regards increment and 



