kirkwood] method OF ILLV STRATI SG TREES 41 



ive and instructive. The attractiveness of the exhibit is much 

 enhanced if the photographs are printed with a white margin. If 

 such are not available the same effect may be obtained by attach- 

 ing to the back of the picture a sheet of white paper large enough 

 to project the desired distance beyond the margin of the print. 

 The seedling should also be mounted upon white paper of a suit- 

 able quality and size. The use of white cards or margin gives a 

 pleasing contrast and causes the objects to appear in relief against 

 the dark background of gray board. 



A Specimen Fr.ame Illustrating Pinus Ponderos.\. 



