It is further to be considered, that, during these twenty years, the numbers are diminishing by death, and thus the ratio of enfeebled and invalided is increased. Out of 10,000 soldiers who survive and remain in the army in each successive quinquennial period, 768 will be invalided in the first, 680 in the second, 1,023 in the third, and 1,674 in the fourth. In the first year the ratio is 181, in the fifth 129, in the tenth 165, in the fifteenth 276, and in the twentieth 411, among 10,000 surviving and remaining. The depressing and exhaustive force of military life on the soldiers is gradually accumulative, or the power of resistance gradually wastes, from the beginning to the end of service. There is an apparent exception to this law in the fact, that, in the British army, the ratio of those who were invalided was 181 in 10,000, but diminished, in the second, third, and fourth years, to 129 in the fifth and sixth, then again rose, through all the succeeding years, to 411 in the twentieth. The experience of the British army, in this respect, is corroborated by that of ours in the Mexican War. From the old standing army 502, from the additional force recently enlisted 548, and from the volunteers 1,178, in 10,000 of each, were discharged on account of disability. Some part of this great difference between the regulars and volunteers is doubtless due to the well-known fact, that the latter were originally enlisted, in part at least, for domestic trainings, and not for the actual service of war, and therefore were examined with less scrutiny, and included more of the weaker constitutions.