PREPARATIONS OF WOODS FOR STEREOPTICON. These are 

 transverse sections from ]-400 to 1-600 in. thick, mounted between glass 

 of standard stereopticon-slide size, 3^x4 in., and enable the display of character- 

 istic wood-structures, projected from nature itself, in a most satisfactory manner. 

 The wood-section covers a circular field generally 2^ in. in diameter on the 

 slide. 



Price, 50 cents each ; $10 per twenty-five, the purchaser's selection. 



ROMEYN 8i HOUGH, 



U8L1SHER 

 AMERICAN WOODS. ' 



A MICROSCOPE MOUNT. NATURAL SIZE 



MOUNTS OF WOODS FOR MICROSCOPE. These are transverse, 

 radial and tangential sections, mostly 14200 in. thick, stained with 

 methyl green and mounted in Canada balsam. They are of great value for 

 study with the microscope, and for projection with the projecting microscope 

 when considerable magnification is desired. It is in this way only that radial 

 and tangential sections can be projected with entirely satisfactory results. 



Price, 50 cents each ; $10 per twenty-five, the purchaser's selection. 



