avoid giving you an abstract of the discussions to which this case gave rise.”[6]—Dr. Thomson goes on to say, that “M. Gaulard, Physician in ordinary to the King, was called to see the son of Delatour on the third day of the eruption, which he declared to be a mild case of Small Pox, of the kind commonly called, he says, though improperly so, Chicken Pox, and the disease in the boy’s companions he considered of the same nature.”—Four physicians were called in to consult with Mons. Gaulard, who[7] “gave an account of the progress of the disease which contains a description of varioloid eruptions, very similar to those which have of late been described under the denomination of modified Small Pox. ----- Footnote 6: Dr. Thomson’s Sketch, &c. p. 53. Footnote 7: Dr. Thomson’s Sketch, &c., p. 54. ----- “These gentlemen mention also, that _two_ of the other children affected, had previously passed through natural Small Pox; and conclude with declaring that, from these circumstances, they believe that the disease in Delatour and his companions, _was neither the Small Pox nor the Chicken Pox, but a chrystaline eruption, with which they were well acquainted_.” It is, I think, from this sufficiently evident, that nothing but the preconceived opinions of the physicians consulted in these cases could have prevented their acknowledging the true nature of the disease; and there cannot, I conceive, be a doubt, that it was no other than Small Pox rendered milder in its character by the previous occurrence of it in these children. It is of importance too to remember that they afford examples of the recurrence of the disease after both _natural_ and _inoculated_ Small Pox. Delatour had been inoculated upwards of two years before, and “two of the other children affected had previously passed through natural Small Pox.” I shall here adduce some further extracts from Dr. Thomson’s work. He tells us that “M. Hosty, who had been sent over to England in 1755, to acquire information upon the subject of inoculation,” “enters into a discussion with respect to the recurrence of secondary Small Pox, in which he allows that there are several eruptive diseases with which a person may be affected, _so like the Small Pox, as scarcely to be distinguishable from them_, and, on that account, liable to give rise to many mistakes; and he states, that although he does not deny absolutely the possibility of the recurrence of Small Pox, he believes this to be rare,” (p. 55-6). “To Hosty’s opinion, with regard to the unfrequency of the occurrence of secondary Small Pox, Gaulard replied, that he had at that time under his charge two unequivocal examples of secondary natural Small Pox, and that a nephew of the Archbishop of Paris, had a month before passed through the Small Pox, under the care of the celebrated M. Astruc, although he bore marks on his body of having formerly undergone the disease.”—(p. 59.)