is a gradual increment of insensible changes of which again we seek in vain for an explanation. The effect of this mode of presenting evolution or the unification of knowledge is heightened by the seemingly systematic manner of its exposition. Development is shown to be universally characterised by progress in three forms--namely, from a simple, indefinite, incoherent state to a complex, definite, and coherent state: and the wonderful scope which the universe affords, both in time and space, for historically exhibiting these traits, overwhelms the mind with a sense of the universality of evolution, in spite of the fact that all the time the very point of the question is missed in the absence of any explanation. We recognise the gradual development, but where is the deductive connexion? Where is the promised system of corollaries from original factors which shall account for the historical development? Thus, when in the "Data of Ethics" we find a reference to the Biology, the Psychology, and the Sociology as parts of an established philosophical system we are apt to suppose that the views as to ethics which Mr. Spencer expresses derive their authority from an antecedent apprehension of the cosmical process; whereas this is not really the case: and although it is essential to the study that ethics should be viewed as dependent upon the sciences named, yet such a connexion is not shown as one of logical order; we are only told that Ethics exhibits similar traits in its order of development.