Crude as these answers are, they are at your service; and I am prompted to give them from the fact, that very few persons, I presume, have been so far reduced as myself, with dyspepsia and its concomitants. In fact, I was pronounced, by some of the most scientific physicians of Boston, as past all prospect of cure, or even much relief, from medicine, diet, or regimen. My attention has naturally been turned with anxious solicitude to the subject of diet, in all its forms. Since my unexpected restoration to health, my opportunities for observation among dyspeptics have been much enlarged; and I most unhesitatingly say, that my success is much more encouraging, in the management of such cases, since pursuing a more liberal diet, than before. Plain animal diet, avoiding condiments and tea, using mucilaginous drink, as the Irish Moss, is preferable to "absolute diet,"--cases of decided chronic gastritis excepted. Yours, etc., H. N. PRESTON. LETTER V.--FROM DR. H. A. BARROWS. PHILLIPS, Somerset Co., Me., April 28, 1835. DEAR SIR,--I have a brother-in-law, who owes his life to abstinence from animal food, and strict adherence to the simplest vegetable diet. My own existence is prolonged, only (according to human probabilities) by entire abstinence from flesh-meat of every description, and feeding principally upon the coarsest farinacea. Numberless other instances have come under my observation within the last three years, in which a strict adherence to a simple vegetable diet has done for the wretched invalid what the best medical treatment had utterly failed to do; and in no one instance have I known permanently injurious results to follow from this course, but in many instances have had to lament the want of firmness and decision, and a gradual return to the "_flesh-pots of Egypt_." With these views, I very cheerfully comply with your general invitation, on page 77, volume 12, of the Boston Medical and Surgical Journal. The answers to your interrogatories will apply to the case first referred to, to my own case, and to nearly every one which has occurred within my notice. 1. Increased, uniformly; and in nearly every instance, without even the usual debility consequent upon withdrawing the stimulus of animal food. 2. More agreeable in every instance. 3. Affirmative, _in toto_. 4. None aggravated, except flatulence in one or two instances. All the horrid train of dyspeptic symptoms uniformly mitigated, and obstinate constipation removed. 5. Fewer colds and febrile attacks. 6. Three years, with my brother; with myself, eighteen months partially, and three months wholly; the others, from one to six months. 7. Negative. 8. Cold water--my brother and myself; others, hot and cold water alternately. 9. More aperient,--no exceptions. 10. I believe the health of _students_ would uniformly be promoted--and the days of the laborer, to say the least, would be lengthened.