Mrs. Brownson received Henry's letter of the 13th yesterday and was much surprised that he had not heard from them lately. This is the tenth letter she has written him since he left home on March7. The last time she wrote she enclosed a letter for Henry by Edward Patrick Brownson. Orestes A. Brownson is lame but walked to church last Sunday. Edward received his commission as additional aide de camp to General Fremont with the rank of captain about the 6th and left home on the 11th. He arrived in Washington on the 12th. He was waiting with an army and a navy surgeon to go to Manassas Junction. Mr. Howell went to Washington to see the Army of the Potomac and expects to see Henry. Fathers Henry and Howell say four Masses this week for Henry and Edward. A cousin of General Kearney was there two or three times last week. He is authorized to get up a company and has an office in Dr. Grier's, their mayor's office. They hope Henry has received the letters they sent on the 12th. Sarah M. Brownson intends going next Saturday to Bridgeport to see Mrs. Henry S. Hewit. Dr. Henry S. Hewit's health is improving but he is very impatient; he is still at Cincinnati. ` A.L.S. 3pp. 12mo. ` Enclosure: