Yea, a little Cur, by the Power of Smelling, can find out his Master among Thousands, will trace his Steps thro’ Crouds in Fairs and Markets; yea, throughout a whole Country. Our Histories inform us of Dogs in some parts of this Island, that being put upon the Scent, would pursue a Thief and a Murderer; and if he cross’d a River, would smell where he entered, and swim after him; and when arrived at t’other side, would hunt about till they found where he landed, and then run on, till they overtook the Criminal. In Animals is a sulphurous or oily Matter, so attenuated and subtiliz’d as to become volatile, which is denominated a Spirit: Now that there is such a Spirit in Man, and a peculiar one too in every Man, is evident from these Dogs, which will pursue the Game by their Nose, and follow their Master’s Track, and distinguish it precisely; yea, tho’ a thousand other Persons had past the same way. It must be by meer Force of Smelling, that the Dog is able to do this, that is, to distinguish his Master from all Men by the Instrumentality of his Nose. Therefore there must be some specifick Matter exhaled from the Master’s Body, which the Dog can perfectly distinguish from the various Effluvia flowing from all other Persons. The Dog must exceed us, in that he can thus exactly discern his Master, by these subtile, oily, or sulphurous Effluvia, which no human Nose was ever able to do. We find the like Spirit in the Hound, who when put in the Track which a Deer has lately been in, will follow the Steps of that Deer thro’ all cross Paths of a thousand others, and at last single out that individual Deer among a whole Herd of those Animals. In _Scotland_ are a sort of Dogs (in Colour generally red and spotted with black, or black with red) of extraordinary Sagacity, being, as ’tis said, put upon the Scent, will pursue Thieves with Success; and the Use of them has been authorised by the Magistrate——_Nullus perturbet aut impediat canem trasantem, aut homines transentes cum ipso ad sequendum latrones aut ad capiendum malefactores_. _N. B._ _Trasantem_ is a Word latiniz’d from the old _French_ _Tracer_ or _Trasser_, signifying to follow by the Track. If any shou’d suggest, That this derogates from the Wisdom and Goodness of the Creator, who has given to some Beasts stronger Perceptions, Nerves more exquisitely fine and delicate than he has bestow’d upon Man: I answer, this is so far from derogating from divine Wisdom and Goodness, that it is an admirable Instance and Illustration of both; for were our olfactory Nerves susceptible of such quick Sensations as Dogs and some other Animals, we shou’d be continually annoy’d with pestiferous Fumes and Exhalations, so as not only to render most Situations troublesome, but even Life it self miserable and wretched.