We are ready to concede the 100 millions of years offered by Geology, since we are taught that our present physical mankind—or the Vaivasvata Humanity—began only eighteen millions of years ago. But Geology has no facts to give us for the duration of geological periods, as we have shown, no more indeed than has Astronomy. The authentic letter from Mr. W. Pengelly, F.R.S., quoted elsewhere, says: It is at present, and perhaps always will be, _impossible_ to reduce, even approximately, geological time into years or even into millenniums. And having never, hitherto, excavated a fossil man of any other than the _present form_—what does Geology know of him? It has traced zones or strata and, with these, primordial zoological life, down to the Silurian. When it has, in the same way, traced man down to his primordial protoplasmic form, then we will admit that it may know something of primordial man. If it is not very material to “the bearings of modern scientific discovery on modern thought,” whether Man has existed in a state of constant though slow progression for the last 50,000 years of a period of 15 millions, or for the last 500,000 years of a period of 150 millions,(157) as Mr. S. Laing tells his readers, it is very much so for the claims of the Occultists. Unless the latter show that it is a _possibility_, if not a perfect certainty, that man lived eighteen millions of years ago, the _Secret Doctrine_ might as well have remained unwritten. An attempt must, therefore, be made in this direction, and it is our modern Geologists and men of Science generally who will be brought to testify to this fact in the Third Part of this Volume. Meanwhile, and notwithstanding the fact that Hindû Chronology is constantly represented by the Orientalists as a fiction based on no “actual” computation,(158) but simply a “childish boasting,” it is nevertheless often twisted out of recognition to make it yield to, and fit in with, Western theories. No figures have ever been more meddled with and tortured than the famous 4, 3, 2, followed by cyphers, of the Yugas and Mahâ Yugas. As the whole Cycle of pre‐historic events, such as the evolution and transformation of Races and the extreme antiquity of man, hangs upon the said Chronology, it becomes extremely important to check it by other existing calculations. If the Eastern Chronology is rejected, we shall at least have the consolation of proving that no other—whether in the figures of Science or of the Churches—is one whit more reliable. As Professor Max Müller expresses it, it is often as useful to prove what a thing is not as to show what it may be. And once we succeed in pointing out the fallacies of both Christian and Scientific computations—by allowing them a fair chance of comparison with our Chronology—neither of these will have a reasonable ground to stand upon, in pronouncing the Esoteric figures less reliable than its own.