Tribune correspondent about the proposed exchange. Nobody has seen this telegram but the operator.

BENJ. F. BUTLER,

Major-General, Commanding.

OFFICE COMMISSARY-GENERAL OF PRISONERS,

Washington, D. C., March 12, 1864.

Brigadier General A. SCHOEPF, Commanding Fort Delaware, Del.:

GENERAL: I have the honor to inclose herewith some extracts from a report made by Medical Inspector Johnson to the Medical Inspector-General of the Army, of his inspection of the prison and hospital at Fort Delaware. Colonel Johnson mentions several matters where changes may be made to advantage, which I beg to call your attention to, feeling assured that nothing more is necessary to bring about all proper and practicable reforms. The ration of coffee may with propriety be increased, and such vegetables may be purchased as you may deem necessary.

Very respectfully, your obedient servant,

W. HOFFMAN,

Colonel Third Infantry and Commissary-General of Prisoners.

[Inclosure.]

MEDICAL INSPECTOR-GENERAL'S OFFICE,

Washington, D. C., March 8, 1864.

COMMANDING GENERAL, Fort Delaware:

(Through Colonel Hoffman, Commissary-General of Prisoners.)

SIR: The following extracts are from the general report of Medical-Inspector Johnson in relation to the post hospital and prison at Fort Delaware, dated February 29, 1864:

A special report upon the post hospital at Fort Delaware accompanies this. In that are given separately the mortuary statistics for the prisoners of war and for the garrison at that post from the 1st of November, 1863, to the 1st of February, 1864. For that period of three months we have these results.

Prisoners of war. -Mean strength, 2,747; average number taken sick each month, 856; average number daily sick, 611; mean average rate of daily sickness, 22 2/10 per cent. Total deaths in three months, 311; average number of deaths in each month, 103 2/3, being at the rate of 452 8/10 deaths per annum for 1,000 of strength. A large percentage of the mortality it will be noted was from smallpox, namely, 112 deaths in three months. The principal diseases were as follows:

Disease. Number of cases Number of deaths

in three in three months.

months.

Scurvy. 365 15

Smallpox. 226 112

Varioloid. 136 . . .

Typhoid fever. 18 12

Typho-malarial fever. 185 9

Malarial fever. 189 . . .

Diarrhea, acute and 169 60

chronic.

Dysentery, acute and 62 10

chronic.

Erysipelas. 91 11

Pneumonia. 91 45