Autograph Letter Signed to an unnamed correspondent (Dr Therrison?)

Editor of "Portraits ef the Nobility" and "Portraits of the children of the nobility" (1838). Three pages, 4to, small tears on folds but good condition. She promises Miss Therrison some autographs [perhaps the poets she edited for the above-mentioned book?] and declines an invitation on behalf of her son. She finds her current home "salubrious" for her children and herself. "John likes his occupations here and has received the most flattering letters of approval from the D. of Rutland." She concludes with the cold weather there and in Hampstead.