This book is but one of 4 volumes (plus an index by Dexter)
v. 1 - A to C
v. 2 - D to J (F @ 2:135)
v. 3 - K to R
v. 4 - S to Z
The index cross-references all spousal surnames mentioned throughout the four book series.
NOTE: the OCR (optical reader) for this series of books is quite frankly awful. All copies but the original book images are not worth trying to read, they are extremely error prone. Be sure to verify ALL details with the original scanned book images,

Additions and corrections appear across multiple volumes. I have grouped all the corrections I have found by volume number:

Additions and corrections to Vol. 1
vol : pg
1 : 497 - Additions & Corrections to v.1
3 : 596 - More Additions & Corrections to v.1
4 : 673 - More Additions & corrections to v. 1

Addition and Corrections to Vol. 2:
vol : pg
2 : 135: Supplemental Corrections and Additions for Earle (p. 91-92)
2 : 577 Additions & Corrections to v. 2
3 : 614 - More Additions & Corrections to v.2
4 : 680 - More Additions & corrections to v. 2

Addition and Corrections to Vol. 3:
vol : pg
3 : 642 - Additions and Corrections to v.3
4 : 687 - More Additions & corrections to v. 3

Addition and Corrections to Vol. 4:
vol : pg
4 : 703 - Additions and corrections to v. 4
---------
4 : 737 the cross-index by Dexter can be found at the end of at least one copy of vol. 4.

Supplemented by: "A genealogical cross index of the four volumes of the Genealogical dictionary of James Savage. By O.P. Dexter ..." (38 p. 24 cm.) published: New York, O.P. Dexter, 1884. Call number: [F7.S26 Index]

@ Internet Archive. stand alone book: https://archive.org/details/cu31924030935757/page/n8/mode/1up