40 NATURE STUDY REVIEW [8:1— Jan., 1912 



4. A section of the wood. For this purpose the sections 

 sold by Romeyn B. Hough of Lowville, N. Y., are the most satis- 

 factory, and as the most important trees of the country are now 

 represented in the series, and individual cards showing trans- 

 verse, radial and longitudinal sections can be obtained at a nom- 

 inal cost, most of the wood material required mav easily be se- 

 cured. The cards should be mounted entire, 



5. Photographs. Space still remains for two pictures 5 by 

 7, or 6| by 8^ inches. These may represent individual trees at 

 close view, showing the character of the bark or other features, or 

 a more distant view showing the typical form of the crown. It 

 IS often desirable to have a landscape scene depicting the habitat 

 of the species. Most of the photographs desired may be obtained 

 of the Forest Service at a small price. 



(J. A printed label giving the' common and scientific name 

 of the tree may be mounted at the bottom of the card. 



After mounting the objects on the card it may be placed in 

 the frame and held in position by two strips of corrugated board 

 such as is often used in the backing of pictures. As this board 

 may be obtained in 14 inch widths, two 22-inch lengths exactly 

 fill the back of the frame, and may be held in place by small 

 brads. Two screw-eyes set into the top of the frame serve best as 

 a means of suspending it, either by picture wire, or by hooking 

 the eyes over nails set in a strip of wood fastened to the wall. 



The cost of one of these preparations, exclusive of the 

 branch and seedlings, should be about .$2.00 distributed as fol- 

 lows: 



Frame $0.50 



Jap-a-lac 05 



Glass 45 



Card 10 



Map 02 



Wood sections 25 



Photos .SO 



Label 10 



Corrugated Ijoard 15 



Screw eyes 02 



Total $1:94 



These preparations are especially helpful as demonstrations 

 of the characteristics and habits of the trees. They may also be 

 used as charts illustrating lectures. In this use they may readily 

 be interchanged or transferred from one position to another, the 

 screw-eyes at the top of the frame facilitating this operation. The 

 weight of a single preparation is about ten pounds. As museinn 

 exhibits or as decorations of laboratory interiors they are attract- 



