What gift did Gilbert offer Helen?

Gilbert offered Helen a book as a gift.

Leaving him thus haranguing the people, more to their amusement than edification, I returned to the house, and, having made some alteration in my toilet, hastened away to Wildfell Hall, with the book in my pocket; for it was destined for the shelves of Mrs. Graham.

“What! then had she and you got on so well together as to come to the giving and receiving of presents?”—Not precisely, old buck; this was my first experiment in that line; and I was very anxious to see the result of it.