4. I was formerly very much afflicted with the headache, and sometimes was troubled with rheumatism. I have very seldom, for the last two years especially, been troubled with either; and when I have had a turn of headache, it is light indeed compared with what it was before we adopted this system of living. My wife was very dyspeptic, and often had severe turns of palpitation of the heart; the latter is entirely removed, and she seldom experiences any inconvenience from the former. Our nurse was formerly, and still is, troubled with severe turns of headache, though not so bad as formerly; and I think she would have much less of it if she were placed in a different situation. 5. We scarcely know what it is to have a cold; my wife in particular. Previously to our change of diet, I was very subject to severe colds, attended with a hard cough, which lasted, sometimes, for several weeks. 6. As before stated, we exclude animal food from our diet, as well as tea and coffee. 7. Before we adopted a vegetable diet, we always had meat for dinner, and generally with breakfast; and not unfrequently with tea. Tea and coffee we drank very strong. 8. We have substituted milk and water sweetened, for tea and coffee. 9. Most vegetables I find have a tendency (especially when Graham or unbolted wheaten flour is used) to keep the bowels open; to counteract which, we use rice once or twice a week. Potatoes, when eaten freely, are flatulent, but not inconvenient when eaten moderately. 10. I think the health of students, by the exclusion of animal food from their diet, would be promoted, especially if they excluded tea and coffee also; and I can see no good reason why it should not be beneficial to laboring people. I have conversed with two or three mechanics, who confirm me in this belief. 11. Graham bread, as we call it, eaten with milk, or baked potatoes and milk, for most people, I think would be healthy; to which should be added such a proportion of rice as may be found necessary. Thy friend, JOSEPH RICKETSON. LETTER X.--FROM JOSEPH CONGDON, ESQ. NEW BEDFORD, Sept., 1835. ANSWERS to Dr. North's inquiries on diet. 1. Increase of strength and activity, connected with, and perhaps in some good degree a consequence of, an increase of daily exercise. 2. Process of digestion more regular and agreeable. 3. Mental activity greater; no decisive experiments on the ability to _continue_ a laborious investigation. 4. Dyspepsia of long continuance, and also difficult breathing; inflammation of the eyes. 5. Fewer colds; febrile attacks very slight; great elasticity in recovering from disease. Some part of the effect should undoubtedly be ascribed to greater attention to the skin by bathing and friction. 6. Twenty-six months of _entire abstinence_ from all animal substances, excepting butter and milk. Salt is used regularly. 7. Through life inclined to a vegetable diet, with few stimulants.