GOOD NEWS FROM ARKANSAS. A Cairo dispatch of yesterday furnishes the following very agreeable news:
The ram Switzerland arrived this evening from the squadron. She brings news of the taking of Arkansas Post, on the Arkansas river, one hundred miles from the mouth, by the land and naval forces under General McClernand and Commodore Porter. The surrender occurred on Sunday, with all the guns, stores and ammunition. Full particulars have not yet been received. Our loss was reported at two hundred, while that of the rebels was five hundred and fifty in killed and wounded, and from five to seven thousand in prisoners. These results may be modified by fuller and more authentic accounts.