With the presentation of this volume on molecular physics we reach just about the half-way mark in the publication of our series on experimental physics. This occasion gives me a chance to review briefly the present status of the whole series and the expectations for finishing the job. First of all the companion volume to Nuclear Physics, 5A, is going to come out soon. The manuscripts are coming in fast and I sincerely hope that by the time these lines are printed we will be a t the galley proof stage of Volume 5B. Equally favorable is my report on the electronics Volume 2. A good part of the manuscripts have already been processed and the few missing ones should be in within the next few months so that concurrently with Volume 5B, Volume 2 also may be ready for the printer.
The atomic and electron physics volume will have to be split, also, into Volumes 4A and B. Some of the manuscripts of 4A are on hand but it will take probably several months before we can start typesetting this volume.