THE SUICIDE OF GEN. UPTON FOUND DEAD IN HIS ROOM IN SAN FRANCISCO. DISCOVERED WITH A REVOLVER IN HIS HAND AND A BULLET-WOUND IN HIS BRAIN--- LETTERS LEFT GIVING A WARNING OF HIS DEATH---IMPRESSIONS AS TO HIS MOTIVE. SAN FRANCISCO, March 15.---Brevet Major- Gen. Emory Upton, United States Army, was found dead in his bed at the Presidio, this morning, having shot himself through the head some time during the night. Gen. Upton retired at about his usual hour last night, having spent the evening in social converse. The first intimation of the tragedy was obtained this morning between 8 and 9 o'clock, when his orderly went to call the General. Receiving no answer to his knock, the orderly opened the door and found the officer dead in bed. An alarm was instantly given, and several officers of the regiment, having hastened to the room, it was discovered that the General had committed suicide. A revolver was still grasped in his hand and a bullet wound through his mouth into the brain told the history of his death plainly. The body was cold and stiff, and life had evidently been extinct several hours, probably since midnight. No papers or anything that might serve to indi- cate the cause of the act have as yet been discov- ered, but neither the body nor effects in his room have been touched, awaiting the arrival of the Coroner. From the appearance of Gen. Upton's room this morning, he must have sat up until late the night before, writing and destroying manuscript and burning many papers. He left two letters - one to his siter, dated March 13, but apparently written last night, in which he intimated that something might happen; the other, which was unfinished, was addressed to Capt. Dyer, in which Gen. Upton expressed his opinion that his "Revised Tactics" would be a failure. The letters will not be publisheduntil after the inquest to-morrow. Among the Army friends of the deceased officer his suicide is attributed to fear that by the failure of his work on tactics he would lose reputation. The impression among others is that grief at the loss of his wife prompted the deed. THE DEAD OFFICER'S SERVICES. Gen. Emory Upton was born in this City in 1840. He was consequently in his forty-first year. He entered the Military Academy at West Point on July 1, 1856, and was graduated on May 6, 1861, standing eighth in his class. His first position was as Second Lieutenant in the Fourth Artillery, and his first service was the drilling of volunteers at Washington from May 7 to 27, 1861. On the latter he was appointed aid-de-camp to Brig. Gen. D. Tyler, and served in that capacity first in the defenses at Washington and then through- out the Manassas campaign. He was under fire at Blackburn's Ford and at the first battle of Bull Run, where he was so severely wounded as to com- pel his retirement on sick leave of absence until August 14, when he resumed duty in the defenses of Washington. In March of the following year he was given command of a battery and went through the Peninsula campaign with the Army of the Potomac, being engaged in the siege of Yorktown, the action at West Point, the battle of Gaine's Mill and the battle of Glendale. He was then promoted to the command of an artil- lery brigade in the First Division of the Sixth Corps, and soon afterward to the Colonelcy of the One Hundred and Twenty-first New-York Volunteers, serving as such in the Maryland campaign of 1862, the Rappahannock campaign of 1862-3, and the Pennsylvania campaign of 1863. He took part in the battles of South Mountain, Antietam, Fred- ericksburg, and Salem Heights, and in the ad- vance upon Falmouth, Va. After a forced march of 35 miles he arrived in time to participate effe- tually in the battle of Gettysburg, and, at its con- clusion,assisted in pursuing the fleeing enemy as far as Warrenton, Va. He was then placed in com- mand of a brigade of the Sixth Corps. In this ca- pacity he served throughout the Rapidan campaign of 1863,being engaged in the capture of the rebel works at Rappahannock Station and in the opera- tions of Mine Run. For gallant and meritorious services on the first-named occasion he was brevet- ted Major Nov. 8, 1863. He went through the Rich- mond campaign of 1863-4, the Washington cam- paign of 1864, and the Shenandoah campaign of the same year. He took part in the battles of the Wilderness, Spottsylvania, Cold Harbor, Peters- burg, around Washington and Opequan. He was wounded at Spottsylvania while leading the assaulting column of 12 regiments of the Sixth Corps upon the enemy's intrenchments on the second day, and was brevetted Lieutenant-Colonel on the field for his gallantry. Two days afterward, on May 12, 1864, he was promoted to be a Brigadier- General of Volunteers. He was wounded again at Opequan, and was obliged to remain on sick leave for nearly a month on account of it. He was brevetted Colonel on the field of Opequan, and a month later, on Oct. 19, 1864, received an additional brevet as Major-General of Volunteers for gallant and meri- torious services at that battle. When he recov- ered he was given command of the Fourth Cavalry Division, and participated in Gen. J.H. Wilson's operations in Alabama and Georgia in the early part of 1865, taking part in the action at Monte- vallo and at Plantersville, in the assault of Selma, and in the assault and capture of Columbus. He had previously been made a full Captain of Artillery on Feb. 22, 1865. For his gal- lantry at the capture of Selma he was breveted as Brigadier-General United States Army, to date from March 13, 1865, and for gallant and meritorious services in the field during the rebellion he received a brevet of the same date as Major-General United States Army. In June, 1865, he was stationed at the Nashville Cavalry depot.