That unfortunate paper, among other oversights I can no longer regard as trivial, disregarded quite completely the fact that a whole literature upon the antagonism of the one and the many, of the specific ideal and the individual reality, was already in existence. It defined no relations to other thought or thinkers. I understand now, what I did not understand then, why it was totally ignored. But the idea underlying that paper I cling to to-day. I consider it an idea that will ultimately be regarded as one of primary importance to human thought, and I will try and present the substance of that early paper again now very briefly, as the best opening of my general case. My opening scepticism is essentially a doubt of the objective reality of classification. I have no hesitation in saying that is the first and primary proposition of my philosophy. I have it in my mind that classification is a necessary condition of the working of the mental implement, but that it is a departure from the objective truth of things, that classification is very serviceable for the practical purposes of life but a very doubtful preliminary to those fine penetrations the philosophical purpose, in its more arrogant moods, demands. All the peculiarities of my way of thinking derive from that. A mind nourished upon anatomical study is of course permeated with the suggestion of the vagueness and instability of biological species. A biological species is quite obviously a great number of unique individuals which is separable from other biological species only by the fact that an enormous number of other linking individuals are inaccessible in time--are in other words dead and gone--and each new individual in that species does, in the distinction of its own individuality, break away in however infinitesimal degree from the previous average properties of the species. There is no property of any species, even the properties that constitute the specific definition, that is not a matter of more or less. If, for example, a species be distinguished by a single large red spot on the back, you will find if you go over a great number of specimens that red spot shrinking here to nothing, expanding there to a more general redness, weakening to pink, deepening to russet and brown, shading into crimson, and so on, and so on. And this is true not only of biological species. It is true of the mineral specimens constituting a mineral species, and I remember as a constant refrain in the lectures of Prof. Judd upon rock classification, the words "they pass into one another by insensible gradations." That is true, I hold, of all things.