irrelevant data have been included? Unessential nnaterial 

 is sometimes found in maps, where the author has retained 

 outlying areas that have no bearing on the current subject. 

 As a result, the map requires a greater reduction than is 

 desirable from the standpoint of legibility. When tempted 

 ta use a completed figure or map that has too much detail 

 or other impairing features, weigh the importance of the 

 idea you wish to communicate and the needs of your readers 

 against the cost of preparing a new illustration. 



Number the text figures consecutively from 1 and refer 

 to them in text by the figure number . Do not refer to figures 

 as charts or graphs. Appendix figures are numbered inde- 

 pendently of regular text figures. They may be designated 

 as Appendix Figure 1 or Figure A-1, and so on. 



The legend is an important part of every illustration. 

 Generally, the figure legend will show the "what," "how 

 classified," "where," and "when," in that order. See that 

 it contains all the information necessary to understand 

 the figure without reference to text . . . that it explains the 

 symbols used, as dashed lines, open circles, et cetera. 

 The legend should be typed in the text near the point of 

 reference to the figure and be separated from the text by 

 horizontal lines. 



Be sure to give credit when reproducing or adapting 

 figures from the work of others. In giving credit, follow 

 these regulations of the Joint Committee on Printing: 



Courtesy credit lines are permissible for uncopyrighted material contributed or 

 loaned by nongovernmental parties. When the department provides copy for such credit 

 lines, they shall be set in the smallest practical type face so that they shall be sub- 

 ordinate both to text and illustration. No credit shall be given when such materials 

 have been purchased by the agency. 



No credit lines shall be permitted for any designer, typographer, or layout artist. 



Copyright lines are permissible for copyrighted materials and die same provision 

 regarding size of type shall apply. 



When all such materials have come from a single nongovernmental source, credit 

 shall be given in an undisplayed preliminary paragraph instead of being repeated on an 

 individual basis. 



When the size of signatures on art work is out of proportion or relation to the design, 

 the copy shall be returned to the department as unacceptable unless the signature is 

 removed or reduced by the Government Printing Office with the approval of the de- 

 partment. 



Copyrighted illustrations may be used only after you 

 have obtained written permission from the owner of the 

 copyright. The description of the illustration must contain 

 the completed statement "Copyright by ; used with per- 

 mission." Proof of written permission must be supplied the 

 Editorial Office with the manuscript. 



