At 4.30, Mrs. Inglethorp, in consequence of a conversation on the validity of wills, makes a will in favour of her husband, which the two gardeners witness. 
The two gardeners served as witnesses when Mrs.Inglethorp created a will.
mnli hypothesis: The two gardeners served as witnesses when Mrs.Inglethorp created a will. premise: At 4.30, Mrs. Inglethorp, in consequence of a conversation on the validity of wills, makes a will in favour of her husband, which the two gardeners witness. 