The Military Committee of the House of Representativos having requested Jieut.-Gen. P. H. Sheridan to supplement his testimony on military affairs, reoently given before the committee, ihat offlcer bas made Üie following adUtional suggestions : It will be aeen ihat ho has out down the appropriation required by the bill introduced by Mr. Maginuis f rom $300,000 to $200,000. In view of the immigration to tho Black Hills, and the present military expedition, this commnnication of the Licutenant-General has peculiar interest : U EAIX JUAUTKUH MlIJTAKY DIVISIÓN OF ) souiu, Obsouk), UI., Fob. 26, 1876. f Tho 'neceasity for two military posta on tlia Yellowstone bas been apparent to me for two yoars past, and I have recommended thoir estabÜHhmeut n my annual reporta. So atrong have I been convinced of this necessfcry that 1 have, without any expense to the Government, made an cxamiuation of ths.Yellowstone liiver, and aelected the poiuts at which they should be built. Tho Indian quo3tion iu the Black Hilla must now be settled by the establishment of the Indiana on the Missouri Biver, aud, in the aocomplishment of this purpose, tho two poats mentioned vrill have to be locatcd, one at or noar the mouth of the Big Hora Biver; the other at or uear the mouth of the Tougue Eiver. Thoae posta can bo supplied by steamboat upthe Yelfowstone, and can be constructed of material found iu the vicinity of the pointe selected. 1 think I can have them built for 100, 000 each ; in other wordH, I will try to build both for $200,000, instead of tho 300,000 Triftiifinnol in tlift hill. The Black Hills country willprobably be covered with towns and viïlages during tlie next five or six years. lts valué will causo the extensión of the Northern Pacific Railroad on the Bouth aide of the Yollowstono, as far aa tho Gallatin vallcy, in Montana, and will also build another railroad from North Platto Station, on the Union Pacitic Kailroad, to the B.'ack Hills. I am of the belief thatthe largest deposito of gold are furthor weet than where tho minera are now working. The headciaarters of Wind Kiver are gold-bearing ; the Owl Creek Monntaiua are gold-bearing ; the Big Hom Valley is gold-bearing ; Powder Eiver is gold-beariug ; also ClarVs Fork' of the Yellowstoue. BeBidea tliis, the Black Hills have abundance of eood timber for tlie troeless countiy south of tliem and west of the Missouri Kiver. The Bucee of all theae intorests dependa on the establishment of the two posta. MUit&rv operations have now been commenccd against the uoatile bands of Sioux, by requost of the Interior Department, and I consider the appropriation so necesaary that I especially reqiieet immediato action on it. (Signed), P. H. Shkuidan. Lieutenant-G eneral.