3339. Inasmuch as such spheres correspond to the sphere of odor [smell], hence, also do odors [arise]. It may, therefore, be proper to mention, that brute animals perceive [sentiant] spheres, which they would never perceive in any other way; so that spheres exist in nature [natura rerum] that are wholly unknown to man, but reign [prevail] among beasts. For example, the dog [canis], who smells [scents] where his master has placed things, which he searches out and finds. He recognizes his master amongst a thousand men, both [simul] from the sphere of subordination, and friendship; thus from [a sphere] of gladness in staying with him, shuns [all] others; and does not rest till he stands at his feet. This is attributed to effluvia; but there is no effluvia, but what is a pretext for such a sphere. The animals possess a sphere of acquaintance with regions of the world which man has never known of. Thus in brambles and woods man continually wanders astray, [but] an animal never; it knows its own home,