But why, then, it may be asked, did he return to a mixed diet, if he had imbibed no doubts in regard to a diet exclusively vegetable; and, above all, how happened he to recover on it? To this it may be replied, that there is every reason to believe, from the tenor of the letter, that he acted against his own inclination, and contrary to his own views, at the request of his friends, and of Dr. Harden, his physician; though Dr. Harden does not expressly say so. Besides, it does not appear that under his mixed diet there was any favorable change, till something like six months had elapsed. This was a period, in all probability, just sufficient to allow the poison of the gases to disappear; after which he might have been expected to recover on any diet not positively bad. If this is not a true solution of the case, how happens it that there was no disease of any organ or function, except the nervous function? There is every reason for believing that Dr. Harden, at the date of his letter, had undergone a change of opinion, and was himself beginning to doubt whether the regimen had any agency in producing the debility.[3]
The case of Dr. Preston is somewhat more difficult. At first view, it seems to sustain the old notion of medical men, that, with a scrofulous habit, a diet exclusively vegetable cannot be made to agree. This, I say, seems to be a natural conclusion, at first view. But, on looking a little farther, we may find some facts that justify a different opinion.
Dr. Preston was evidently timid and fearful—foreboding ill—during the whole progress of his experiment. We think his story fully justifies this conclusion. In such circumstances, what could have been expected? There is no course of regimen in the world which will succeed happily in a state of mind like this.
It should be carefully observed by the reader, that Dr. Preston speaks of entering upon a "severe course of diet;" and also, that, in attempting to give an opinion as to the best kind of vegetable food, he speaks of potatoes, prepared in a certain specified manner, as being preferable to any other. Now, I think it obvious, that Dr. Preston's "severe course" partook largely of crude vegetables, instead of the richer and better farinaceous articles—as the various sorts of bread, rice, pulse, etc.—and, if so, it is not to be wondered at that it was so unsuccessful. In short, I do not think he made any thing like a fair experiment in vegetable diet. His testimony, therefore, though interesting, seems to be entitled to very little weight.
This conclusion is stated with the more confidence, from the fact that some of the best medical writers, not only of ancient times, but of the present day, appear to entertain serious doubts in regard to the soundness of the popular opinion in favor of the "beef-steak-and-porter" system of curing scrofulous patients. Dr. Clark, in the progress of his "Treatise on Consumption," almost expresses a belief that a judicious vegetable diet is preferable even for the scrofulous. He would not, of course, recommend a diet of crude vegetables, but one, rather, which would partake largely of farinaceous grains and fruits. Nor do I suppose he would, in every case, entirely exclude milk.
Dr. Cheyne, in his writings, not only gives it as his opinion that a milk diet, long continued, or a milk and vegetable diet and mild mercurials, are the best means of curing scrofula; but he also says, expressly, that "in all countries where animal food and strong fermented liquors are too freely used, there is scarcely an individual that hath not scrofulous glands." A sad story to relate, or to read! But, Dr. Lambe, of London, and other British physicians, entertain similar sentiments; and Dr. Lambe practices medicine largely, while entertaining these sentiments. I could mention more than one distinguished physician, in Boston and elsewhere, who prescribes a vegetable and milk diet in scrofula.
But, granting even the most that the friends of animal food can claim, what would the case of Dr. Preston prove? That the healthy are ever injured by the vegetable system? By no means. That the sickly would generally be? Certainly not. Dr. Preston himself even specifies one disease, in which he thinks a vegetable diet would be useful. What, then, is the bearing of this single and singular case? Why, at the most, it only shows that there are some forms of dyspepsia which require animal food. Dr. Preston does not produce a single fact unfavorable to a diet exclusively vegetable for the healthy.[4]
It is also worthy of particular notice, that not a fact is brought, or an experiment related, in a list of from thirty to forty cases, reported too by medical men, which goes to prove that any injury has arisen to the healthy, from laying aside the use of animal food. This kind of information, though not the principal thing, was at least a secondary object with Dr. North; as we see by his questions, which were intended to be put to those who had excluded animal food from their diet for a year or more.
But, let us take a general view of the replies to the inquiries of Dr. North. The sum of his first three questions, was,—What were the effects of excluding animal food from your diet on your bodily strength, your mental faculties, and your appetite and animal spirits?
The answers to the three questions, of which this is the same, are, as will be seen, remarkable. In almost every instance the reply indicates that bodily and mental labor was endured with less fatigue than before, and that an increased activity of mind and body was accompanied with increased cheerfulness and animal enjoyment. In nearly every instance, strength of body was actually increased; especially after the first month. A result so uniformly in favor of the vegetable system is certainly more than could have been expected.