Mr. Seward to Mr. Dayton.

[Extract.]

No. 31.]

Sir: * * * * * * * *

You will receive the account of a deplorable reverse of our arms at Manassas. For a week or two that event will elate the friends of the insurgents in Europe as it confounded and bewildered the friends of the Union here for two or three days. The shock, however, has passed away, producing no other results than a resolution stronger and deeper than ever to maintain the Union, and a prompt and effective augmentation of the forces for that end exceeding what would otherwise have been possible. The heart of the country is sound. Its temper is now more favorable to the counsels of deliberation and wisdom.

I am, sir, respectfully, your obedient servant,

WILLIAM H. SEWARD.

William L. Dayton, Esq., &c., &c., &c.