References to Preparations in Preceding Volumes

Of the special features included in previous volumes, all have been retained except the collection of later references to preparations in preceding volumes. This will appear again in Volume VIII. A few corrections to some of the earlier preparations are included in the Appendix. The editors acknowledge their appreciation of the help given by those submitting the corrections, and invite any comments on the preparations in any of the volumes. 

The usual section devoted to later references to preparations in the preceding volumes has been omitted from the present volume. This material will be included in Collective Volume II, covering Volumes X-XIX, which is scheduled to appear in 1942. 

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