The case is very similar to what Dr. WHYTT relates of himself, in his _Observations on Nervous, Hysteric, and Hypochondriac Disorders_, 8vo. 1767[85]; by which, Dr. CULLEN, in p. 10 of his _Clinical Lectures_, says, "he has done more than all his predecessors." Mr. WALLER has written a very sensible Essay on the _Nightmare_--those who are much afflicted with it, cannot lay out 3_s._ 6_d._ better, than in buying his book--12mo. 1816. He says, "it most frequently proceeds from acidity in the Stomach, and recommends _Carbonate of Soda_, to be taken in the Beer you Drink at dinner." He tells us "he derived his information, as to the cause, and cure of this distressing disorder, from a personal acquaintance with it for many years." How devoutly it is to be wished that all Authors would follow good old SYDENHAM and Mr. WALLER'S example,--and give us a register of the progress of those chronic complaints which they have themselves been afflicted with, and the regimen, &c. which they have found most effectual to alleviate and cure them;--and, instead of what they think,--write only what they know,--as the pains-taking SANCTORIUS--SPALLANZANI--BRYAN ROBINSON,--and the persevering and minutely accurately observing Dr. STARK have in their _Dietetical Experiments_. Dr. WHYTT has immortalized himself by the candid relation of his own infirmities, and his circumstantial account of the Regimen, &c. which enabled him to bear up against them,--which forms the most valuable collection of observations on _Nervous Complaints_, that experience and liberality have yet presented to the public. _One page of_ PERSONAL EXPERIENCE, _is worth folios of theoretic Fancies_,--_or Clinical Cases_, which can only be illuminated by the twilight of conjecture:--they may be faithful narratives of the accounts given by Patients, yet, as these are very often imposed upon by their imagination attributing effects to very different causes than those which produce them, they are often very inaccurate deductions. THE DELICATE AND THE NERVOUS, will derive the greatest advantage from keeping _a Register of their Health_,--they should note, and avoid whatever disagrees with them,--and endeavour to ascertain, what kind and quantity of Food--Exercise--Occupation and Pleasures, &c. are most agreeable to their constitution, and take them at those regular periods which appear most convenient to them. However this advice may excite the smiles of those who are swelling "in all the pride of superfluous Health," such methodical movements will considerably improve the enjoyment, and prolong the life of the Valetudinary and the Aged: for whom, Instinct is the best Guide in the choice of Aliment.