And he also admits that morphological cells, when once formed, continue to grow by their own individual power or inherent tendency. But before they can manifest any such inherent tendency, they must be developed from the vital units that lie back of them, and on which their manifestation unquestionably depends. The only doubt that can possibly exist on this point is, that the process of development cannot be determined by microscopic examination. But we may as well assume the presence of vital units in the case of dynamical aggregates, as for Professor Bastian to insist upon crystalline units in the case of statical aggregates or crystals. Both processes, in their initial stages of development, lie beyond the reach of human scrutiny, and all that we know, or possibly can know, is, that certain inorganic conditions are favorable for the development of crystals, as certain organic conditions are favorable for the development of morphological cells. Beyond this Professor Bastian knows nothing--we know nothing. Professor Beale, in his recent work on "the Mystery of Life"--one that is now justly attracting very wide attention--says: "Between the two sets of phenomena, physical and vital, not the faintest analogy can be shown to exist. The idea of a particle of muscular or nerve tissue being formed by a process akin to crystallization, appears ridiculous to any one who has studied the two classes of phenomena, or is acquainted with the structure of these tissues." And he quietly, yet effectively, ridicules the idea that the ultimate molecules of matter--substantially the same matter, in fact--have the power to arrange themselves, independently of vital tendency, alternately into a dog-cell or a man-cell, according to the specific direction they may take, or the incidence of conditions they may undergo, in their primary movement. And for the benefit of Professor Beale, behind whose "bioplasts," we place the "vital unit"--not a variable but a constant unit--we would have him bear in mind (what he so well knows) that the finest fibres that go to make up these tissues lie quite beyond the microscopic limit in their interlaced and spirally-coiled reticulations, so that nothing can be predicated of their ultimate contexture, any more than of the ultimate distribution of matter itself. He has himself traced these wonderfully minute nerve-ramifications under glasses of the highest magnifying power, and knows that their ultimate distribution cannot be reached. Let him come out then, as the ablest vitalist now living, and boldly assert the presence of the man-_unit_ and the dog-_unit,_ instead of falling back on his bioplastic spinners and weavers of tissue, which are only the servants and willing workers of the one integral unit, or life-directing force, within. It is far more rational, and, at the same time, more accordant with strict scientific methods, to attribute these muscular and nerve reticulations to a single