We mention this merely to show the difficulty of classification and not for analogy; for the proper analogy is not between vegetal and animal forms, whether high or low, but between the living and the dead. And here the difficulty is certainly not so great. By suitable tests it is generally possible to distinguish the organic from the inorganic. The ordinary eye may fail to detect the difference, and innumerable forms are assigned by the popular judgment to the inorganic world which are nevertheless undoubtedly alive. And it is the same in the spiritual world. To a cursory glance these rudimentary spiritual forms may not seem to exhibit the phenomena of Life, and therefore the living and the dead may be often classed as one. But let the appropriate scientific tests be applied. In the almost amorphous organism, the physiologist ought already to be able to detect the symptoms of a dawning life. And further research might even bring to light some faint indication of the lines along which the future development was to proceed. Now it is not impossible that among the tests for Life there may be some which may fitly be applied to the spiritual organism. We may therefore at this point hand over the problem to Physiology. The tests for Life are of two kinds. It is remarkable that one of them was proposed, in the spiritual sphere, by Christ. Foreseeing the difficulty of determining the characters and functions of rudimentary organisms, He suggested that the point be decided by a further evolution. Time for development was to be allowed, during which the marks of Life, if any, would become more pronounced, while in the meantime judgment was to be suspended. "Let both grow together," He said, "until the harvest." This is a thoroughly scientific test. Obviously, however, it cannot assist us for the present--except in the way of enforcing extreme caution in attempting any classification at all.