A prescriber can get a good idea of the effect of arrangement by studying the letters sent out by some of the up-to-date business houses. It will be noted that when the amount of reading matter is small it is placed about the middle of the sheet with equal margins above and below, instead of having the reading matter at the top of the sheet and the total margin below. It will also be noted that the margin on the left of the sheet is strictly observed and on the right as far as possible. The application of these rules to prescription writing is illustrated in Part III.

The lines should run straight across the page and the name of the drug and the amount should be on one line except under unusual circumstances, as when the name of the manufacturer is specified in parentheses, or some other descriptive information is given.

The amounts of the different ingredients ordered should be placed under each other and each on a line with the name of the drug to which it belongs.