"Chemists wished to know if butter could engender fat, and doves have been gorged with it, being deprived of all other food during the few days that the experiment lasted; at the end of which time they died, of course excessively lean; and the experimentalists thence concluded that butter does not produce fat. What an extraordinary idea, to feed a granivorous animal upon butter solely, in order to test the question referred to! This experiment forms the subject of a paper written by me, and inserted in the proceedings of the Academy of Sciences, for the year 1844. "Other experiments upon animals, conducted likewise by men of science, are less open to criticism than the one just referred to; yet it must be confessed that no safe inference could be drawn from them. I am about to submit a few established facts, which may throw some light upon the question as to the cause of the development of fat. "For several years past I have given much consideration to the reduction of corpulency in cases where it interfered with the comforts of life, and I can reckon by thousands those who have followed my instructions. I have established it as a fact, without a single exception, that it is always possible to diminish obesity, by living chiefly upon meat, and partaking only of a small quantity of other kinds of food. Make use of whatever medicine you please, it is impossible to obtain the same result in the case of a person partaking indiscriminately of everything which may be placed upon the table. There is yet another condition, without which success is impossible; that is, to absorb but little fluid, whether in the shape of soup or drink, or by means of the bath. A moist atmosphere is favourable to the development of fat: we increase in weight in wet weather. "I have thousands of cases on record, in support of my statement. Persons from all parts of the world, who have followed my teachings, have experienced a decrease of their corpulence." The paper upon this subject ended by saying, that according to my opinion, fat might be assimilated by either of the three several methods set forth in the beginning of the essay, one not forbidding the action of the others. I begged to be acknowledged by the Academy as the first who had established the fact that, in order to reduce corpulence without interfering with the general health, it is necessary to live chiefly upon meat, avoiding an excess of vegetable and aqueous food, or of any of which the basis is carbon or hydrogen.