If a physician uses a filing system (and all should) the copies of the prescriptions should be kept with the case history and other data. The most desirable filing system for this purpose is that which uses folders. A separate folder for each patient enables the physician to carry all matter regarding each case in the most convenient possible way. This data is probably best kept in the office.

The folder should be made for the history, etc., but if the physician contents himself, as many do, with a comparatively brief history, the prescription blank answers well by using one or more sheets. It is advisable to make a carbon duplicate of this also, and keep one in the office, and one can be kept in the study at home for reference, as in reading up on the case.

The blanks and copies answer well for keeping a record of matters of interest concerning the case, as pulse, temperature, etc., at each visit; also for blood-counts, urinalysis, etc., unless special forms are used. These should be filed as suggested for other data.

Some use the blanks for giving receipts for payments received during the day, and the carbon copy left in the book constitutes all the necessary data for making the proper credits when posting the day's work. Except in hospital work, written instructions for patient or nurse are best made on the regular blanks and copies filed with the other data.