(_The Crown Princess of Prussia to Miss Nightingale._) NEW PALACE, POTSDAM, _Sept._ 29. I was delighted to receive your long and interesting letter yesterday, and hasten to express my warmest thanks for it. Every appreciation of Prussia in England can but give me the greatest pleasure.... As you are such an advocate for fresh air, I cannot refrain from telling you what I have myself _seen_ in confirmation of your opinion on the subject, and what I am sure would interest dear Sir James Clark, who is your great ally on this point. In a small well-kept Hospital, where wounded soldiers had been taken care of for some time, the wounds in several cases did not seem to improve, the general state of health of the patients did not show any progress. They were feverish, and the appearance of the wounds was that of the beginning of mortification. In the garden of the Hospital there was a shed or summer-house of rough boards, with a wooden roof; the little building was quite open in front and on the other sides closed up with boards but with an aperture of two feet all the way under the roof--so that it was like being out of doors. Six patients were moved down into this shed (sorely against their will, they were afraid of catching cold). The very next day they got better; the fever left them, the condition of the wounds became healthy; they enjoyed their summer-house--in spite of two violent storms which knocked down the tables; and all quickly recovered! I had seen them every day upstairs and saw them every day in the garden; the difference was incredible.... The Crown Prince wishes me to say what pleasure it gives him to hear you speak in praise of our Prussian army surgeons.... I remain ever, dear Miss Nightingale, yours sincerely, PRINCESS ROYAL. Among other details, a particular kind of field-ambulance was mentioned by the Crown Princess as having proved very useful. Miss Nightingale at once put Dr. Longmore, of our own hospital service, in possession of the facts. It will have been seen that Miss Nightingale's experience was much requisitioned in the War of 1866; but the organization of war-nursing under the Red Cross had not then attained full development owing to the fact that the Austrian Government had not ratified the Geneva Convention of 1864. In 1867 a gold medal was awarded to Miss Nightingale by the Conference of Red Cross Societies at Paris. In 1870 (March 31) the Austrian Patriotic Society for the Relief of Wounded Soldiers elected her an Honorary Member. VI