Does lettering appear large enough and black enough when seen under a reducing glass in the size which will be used for printing?

17. Is all the lettering placed on the chart in the proper directions for reading?

18. Is cross-hatching well made with lines evenly spaced?

19. Can Ben Day work be used advantageously instead of crosshatching?

20. Do the Ben Day shadings selected have sufficient contrast?

21. Are all instructions for Ben Day work given so that it will be impossible for the engraver to make a mistake?

22. Are dimension lines used wherever advantageous?

23. Is a key or legend necessary?

24. Does the key or legend correspond with the drawing?

25. Is there a complete title, clear and concise?

26. Is the drafting work of good quality?

A FEW CAUTIONS 361

27. Have all pencil lines which might show in the engraving been erased?

28. Is there any portion of the illustration which should be cropped off to save space.''

29. Are the instructions for the final size of the plate so given that the engraver cannot make a mistake.''

30. Is the chart in every way ready to mark "O.K"?

The English language has a grammar with hundreds of detailed rules concerning almost every possible construction. Though graphic presentations are used to a very large extent to-day there are at present no standard rules by which the person preparing a chart may know that he is following good practice. This is unfortunate because it permits every one making a chart to follow his own sweet will. Many charts are being put out to-day from which it would seem that the person making them had tried deliberately to get up some method as different as possible from any which had ever been used previously. Anyone of us would be thought of as a freak instead of as a genius, if he tried to invent his own constructions for the English language and to place words in some order never before seen, yet many persons are doing something akin to this when they attempt to present data by some new and outlandish method of charting.