From the Nashpille Union.
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HON. J. M. NILES-PARIY MALIGNITY

 It will be recoilected by our readers that the lion. John M. Niles, one of the most amlable men living, has been prevented by continued affliction and sickness, which oc- casioned temporary alteration of mind, from repairing to Washington, and presenting the credentials of his reelection to the Senate of the United States from Connecticut until a few days since. The whig papers had been torsome time charging that he was hopelessly insane, and expressing determination, when the present Whig Legislature of that State should convene, that his alleged incapacity should be seized upon as a pretext for de- claring his seat vacated, in order that whig might ie forthwith elected to supercede him. In this state of things, Mir Niles having been perfectly restored to health and sUu71ff11Uss Uff mind-excessive grief for the severest and most heart-rending afllictions having caused his illness-presented himself 'ih the Senate on the morning of the 30th of April to take his seat, and Governor Fairfield, democratic Senator from the State of Maine, presented his credentials of election, under the s Broad Scalp of Connecticut, and made the usual motion that he should be qualified and take his seat Mr. Jarnagin from Tennessee, just fit to be put upon so degrading a service, who, 1t is quite certain, had never seen Mr. Niles before, objected, and moved for a con- mittee of investigation (of which he would be ehaTman of course) to enquire and report upon'the sanity and eligibility of Mr. Niles to his seat. IL was in vain that Gov Fairfield testified to the sanity of hr. Niles. Mir. Niles himself, however, to ob1iate all difficulty, with calm dignity, invited and desired the Investigation, and the committee, consisting of five members, was ppointed-who are, Messrs. Jarnagin, (chairman,) Benton, Der rlen, Wright, and McDufiie.

 That MT. Niles, who is a gentleman of distinguished attainments, will be admitted to his seat, we have no doubt. We state the case with view of bringing to the notice of the public the gross and palpable indelicacy the total want of the ordinary feelings of humanity, which characterize the proceeding. It was calculated to lacerate and tear open the newly cicatrized wounds under which Mr. Niles had been suffering, and by causing them to bleed atresh, possibly to bring on a relapse of his agonizing malady. Another purpose for which we have referred to the case is, wish 10 introduce to our readers the following letter from a gentleman of the highest responsibility His information is de- rived from near and intelligent family rela- ton of Mr. Niles, ailording grounds for re- posing the fullest reliance in the accuracy and truth of the faets detailed The letter was written without any knowledge of the proceeding at Washington-in fact, on the same day of Mr. Jarnagin's motion;

 LAwRENcEvlLLE, Tenn, April 50, ls4i.

 Cot. LAUGHLIN-Dear Sir For some weeks-indeed for several months-some of the newspapers have been very particular in publishing the sshopeless insanity of Hon. John NJ. Niles of Connecticuto This is a most cruel mistake. Mr. Niles has been long