The digitized copy of this book is available free, online:
The Memorial History of Boston: Including Suffolk County, Massachusetts
Originally published in 1881, it's fully searchable.
Go to
http://books.google.com Select/click "Full view books" and
Type in: memorial history boston
(Note: If you don't click "full view", you’ll include books that show you just "snippets" of the text, not the whole text– which isn’t as useful!)
Click highlighted results to see full book.
The entire book can also be saved as your own pdf file!