92- 97 10. 100% Bar Charts

98-105 11. Comparison of 100% Bar Charts 106-114 12. Multiple Bar Charts

115-120 13. Contrasting Bar Charts --

121-131 14. Pictorial Unit Bar Charts

132-141 15. Comparison of Component Bar Charts

142-148 16. Bilateral Bar Charts

149-152 17. Area Bar Charts

1 53-1 60 18. General Use of Maps

1 61 -1 69 19. Guide and Route Maps

170-177 20. Relief and Aerial Maps

178-186 21. Crosshatched and Colored Maps

187-193 22. Dot and Pin Maps

194-199 23. Maps with Circles and Sector Charts 200-207 24. Maps with Bar Charts

208-210 25. Maps with Curve Charts

211-215 26. Maps with Symbols

216-230 27. Flow Maps

231-237 28. Contour Maps

238-242 29. Distorted Maps

243-246 30. Rating Charts

(For 2nd Half of TOPICAL INDEX, See Page 247)

MAGIC IN GRAPHS

■■■HERE is a magic in graphs. The profile of a curve reveals in "J "J a flash a whole situation -- the life history of an epidemic, a Mfelp^nic, or an era of prosperity. The curve informs the mind, awakens the imagination, convinces.

Graphs carry the message home. A universal language, graphs convey information directly to the mind. Without complexity there is imaged to the eye a magnitude to be remembered. Words have wings, but graphs interpret. Graphs are pure quantity, stripped of verbal sham, reduced to dimension, vivid, unescapable.

Graphs are all inclusive. No fact is too slight or too great to plot to a scale suited to the eye. Graphs may record the path of an ion or the orbit of the sun, the rise of a civilization, or the acceleration of a bullet, the climate of a century or the varying pressure of a heart beat, the growth of a business, or the nerve reactions of a child.