Her two real achievements were letter-writing and hand-work. Over a thousand of her letters have been published. They are lively and entertaining and are valuable for the study of mid-eighteenth-century social life. Especially vivid are her accounts of festivities. The rooms and their furnishings, the gowns and jewels of the ladies, the refreshments served, the guests and their idiosyncrasies, are effectively sketched in. There is humorous appreciation, but no touch of malice, and almost no gossip. The refinement and sweetness of tone in the letters never becomes vapid or mawkish. There is always a counter-balancing gayety and buoyancy of mood. Mrs. Delany must have made letter-writing nearly as much a matter of business as did Miss Seward, but the heavy "epistolary solicitudes" of the Swan of Lichfield are at the other end of the scale from Mrs. Delany's bright naturalness. Mrs. Delany's letters are but a clear medium revealing "the fine lady, the good woman, and the good Christian" of Dr. Delany's picture of "Maria." The most surprising element of Mrs. Delany's life is her hand-work. In October, 1750, she wrote: "I am going to make a very comfortable closet, to have a dresser, and all manner of working tools, to keep all my stores for painting, carving, and gilding, etc., for my own room is now so clean and pretty that I cannot suffer it to be strewed with litter, only books and work, and the closet belonging to it to be given up to prints, drawings, and my collections of fossils and minerals." With almost any tool she had instinctive dexterity, and she had taste and originality. She apparently enjoyed every kind of hand-work that came to her notice. She never wasted a minute. The knotting-shuttle and the embroidery needle were constant attendants on her tea-table hours, and she accomplished almost unbelievable amounts in designing and working fancy gowns, coverings for chairs and sofas, bed-curtains, etc. She made a carpet and other elaborate pieces in double cross-stitch; she did "shell lustres" and chenille work; she designed and executed a chapel ceiling in cards and shells. Most remarkable of all is her herbal begun when she was seventy-two and completed when she was eighty-five. The flowers were made of colored papers and were so accurate as hardly to be distinguished from the flowers themselves. This paper mosaic was left to the Duchess of Portland with a selection of twenty of the flowers to Queen Charlotte. The herbal is now in the British Museum.