What letters were on Mrs. Winthrop's cookies?

Mrs. Dolly Winthrop is a devout Christian and wants to encourage Silas to start going to church. Unsurprisingly, Silas is somewhat reluctant to do so, on account of his unpleasant experiences back in Lantern Yard. Nevertheless, Mrs. Winthrop is nothing if not persistent, and one Sunday afternoon, she pops by Silas's cottage with some cakes she's baked.
The cakes are inscribed with the letters "I.H.S." Mrs. Winthrop hasn't the faintest idea what the letters actually mean, but she saw them in church, so she knows they must have something to do with religion. "I.H.S" is actually a monogram symbolizing Jesus Christ. In the Greek alphabet, "I.H.S" are the first three letters of the name "Jesus."
This episode illustrates the different attitudes toward religion held by Silas and Mrs. Winthrop. Dolly instinctively associates religion with only good things. Silas, on the other hand, still smarting from his appalling treatment by the supposedly good Christian folk of Lantern Yard, sees things rather differently. The simple, undogmatic faith practiced by Dolly bears no resemblance to that practiced in the town Silas was forced to leave behind.