atoms and void, as these did in the originals of all things. Cartesius reckoned to see before he died the sentiments of all philosophers, like so many lesser stars in his romantic system, rapt and drawn within his own vortex. Now I would gladly be informed how it is possible to account for such imaginations as these in particular men, without recourse to my phenomenon of vapours ascending from the lower faculties to overshadow the brain, and there distilling into conceptions, for which the narrowness of our mother-tongue has not yet assigned any other name beside that of madness or frenzy. Let us therefore now conjecture how it comes to pass that none of these great prescribers do ever fail providing themselves and their notions with a number of implicit disciples, and I think the reason is easy to be assigned, for there is a peculiar string in the harmony of human understanding, which in several individuals is exactly of the same tuning. This, if you can dexterously screw up to its right key, and then strike gently upon it whenever you have the good fortune to light among those of the same pitch, they will by a secret necessary sympathy strike exactly at the same time. And in this one circumstance lies all the skill or luck of the matter; for, if you chance to jar the string among those who are either above or below your own height, instead of subscribing to your doctrine, they will tie you fast, call you mad, and feed you with bread and water. It is therefore a point of the nicest conduct to distinguish and adapt this noble talent with respect to the differences of persons and of times. Cicero understood this very well, when, writing to a friend in England, with a caution, among other matters, to beware of being cheated by our hackney-coachmen (who, it seems, in those days were as arrant rascals as they are now), has these remarkable words, _Est quod gaudeas te in ista loca venisse_, _ubi aliquid sapere viderere_ {129}. For, to speak a bold truth, it is a fatal miscarriage so ill to order affairs as to pass for a fool in one company, when in another you might be treated as a philosopher; which I desire some certain gentlemen of my acquaintance to lay up in their hearts as a very seasonable innuendo.