This sender may have had writer's block, who knows?
Mailed from Niagara Falls, NY, July 31, 1910 (at 7 PM no less!)
"Dearest Lillian: Please forgive me for not writing you a letter I didn't write to anyone but Mother. Lovingly, Anna."
Early in the 20th century Niagara Falls was a popular honeymoon destination. Perhaps Anna's mother read the advice given by the good Dr. West and was panicky. Anna wrote to reassure her that all was well.
As Dr. West says, "It is advisable that husband and wife should be alone for a week or two, both in order to enjoy each other’s society, and to become thoroughly acquainted with each other. It is also desirable that this relation should be apart from the family and friends of both."
And that includes nosy friends insisting on letters. Thanks, Muse Swings!