To elevate the properties, which the Thing has, to the independent position of matters, or materials of which it consists, is a proceeding based upon the notion of a Thing: and for that reason is also found in experience. Thought and experience however alike protest against concluding from the fact that certain properties of a thing, such as colour, or smell, may be represented as particular colouring or odorific matters, that we are then at the end of the inquiry, and that nothing more is needed to penetrate to the true secret of things than a disintegration of them into their component materials. This disintegration into independent matters is properly restricted to inorganic nature only. The chemist is in the right therefore when, for example, he analyses common salt or gypsum into its elements, and finds that the former consists of muriatic acid and soda, the latter of sulphuric acid and calcium. So too the geologist does well to regard granite as a compound of quartz, felspar, and mica. These matters, again, of which the thing consists, are themselves partly things, which in that way may be once more reduced to more abstract matters. Sulphuric acid, for example, is a compound of sulphur and oxygen. Such matters or bodies can as a matter of fact be exhibited as subsisting by themselves: but frequently we find other properties of things, entirely wanting this self-subsistence, also regarded as particular matters. Thus we hear caloric, and electrical or magnetic matters spoken of. Such matters are at the best figments of understanding. And we see here the usual procedure of the abstract reflection of understanding. Capriciously adopting single categories, whose value entirely depends on their place in the gradual evolution of the logical idea, it employs them in the pretended interests of explanation, but in the face of plain, unprejudiced perception and experience, so as to trace back to them every object investigated. Nor is this all. The theory, which makes things consist of independent matters, is frequently applied in a region where it has neither meaning nor force. For within the limits of nature even, wherever there is organic life, this category is obviously inadequate. An animal may be said to consist of bones, muscles, nerves, &c.: but evidently we are here using the term 'consist' in a very different sense from its use when we spoke of the piece of granite as consisting of the above-mentioned elements. The elements of granite are utterly indifferent to their combination: they could subsist as well without it. The different parts and members of an organic body on the contrary subsist only in their union: they cease to exist as such, when they are separated from each other.