It was under the sea, at first for food and later for other purposes, that they first created earth-life — using available substances according to long-known methods. The more elaborate experiments came after the annihilation of various cosmic enemies. They had done the same thing on other planets; having manufactured not only necessary foods, but certain multicellular protoplasmic masses capable of moulding their tissues into all sorts of temporary organs under hypnotic influence and thereby forming ideal slaves to perform the heavy work of the community. These viscous masses were without doubt what Abdul Alhazred whispered about as the “shoggoths” in his frightful Necronomicon, though even that mad Arab had not hinted that any existed on earth except in the dreams of those who had chewed a certain alkaloidal herb. When the star-headed Old Ones on this planet had synthesised their simple food forms and bred a good supply of shoggoths, they allowed other cell-groups to develop into other forms of animal and vegetable life for sundry purposes; extirpating any whose presence became troublesome.
With the aid of the shoggoths, whose expansions could be made to lift prodigious weights, the small, low cities under the sea grew to vast and imposing labyrinths of stone not unlike those which later rose on land. Indeed, the highly adaptable Old Ones had lived much on land in other parts of the universe, and probably retained many traditions of land construction. As we studied the architecture of all these sculptured palaeogean cities, including that whose aeon-dead corridors we were even then traversing, we were impressed by a curious coincidence which we have not yet tried to explain, even to ourselves. The tops of the buildings, which in the actual city around us had of course been weathered into shapeless ruins ages ago, were clearly displayed in the bas-reliefs; and shewed vast clusters of needle-like spires, delicate finials on certain cone and pyramid apexes, and tiers of thin, horizontal scalloped discs capping cylindrical shafts. This was exactly what we had seen in that monstrous and portentous mirage, cast by a dead city whence such skyline features had been absent for thousands and tens of thousands of years, which loomed on our ignorant eyes across the unfathomed mountains of madness as we first approached poor Lake’s ill-fated camp.
Of the life of the Old Ones, both under the sea and after part of them migrated to land, volumes could be written. Those in shallow water had continued the fullest use of the eyes at the ends of their five main head tentacles, and had practiced the arts of sculpture and of writing in quite the usual way — the writing accomplished with a stylus on waterproof waxen surfaces. Those lower down in the ocean depths, though they used a curious phosphorescent organism to furnish light, pieced out their vision with obscure special senses operating through the prismatic cilia on their heads — senses which rendered all the Old Ones partly independent of light in emergencies. Their forms of sculpture and writing had changed curiously during the descent, embodying certain apparently chemical coating processes — probably to secure phosphorescence — which the bas-reliefs could not make clear to us. The beings moved in the sea partly by swimming — using the lateral crinoid arms — and partly by wriggling with the lower tier of tentacles containing the pseudo-feet. Occasionally they accomplished long swoops with the auxiliary use of two or more sets of their fan-like folding wings. On land they locally used the pseudo-feet, but now and then flew to great heights or over long distances with their wings. The many slender tentacles into which the crinoid arms branched were infinitely delicate, flexible, strong, and accurate in muscular-nervous coördination; ensuring the utmost skill and dexterity in all artistic and other manual operations.
The toughness of the things was almost incredible. Even the terrific pressures of the deepest sea-bottoms appeared powerless to harm them. Very few seemed to die at all except by violence, and their burial-places were very limited. The fact that they covered their vertically inhumed dead with five-pointed inscribed mounds set up thoughts in Danforth and me which made a fresh pause and recuperation necessary after the sculptures revealed it. The beings multiplied by means of spores — like vegetable pteridophytes as Lake had suspected — but owing to their prodigious toughness and longevity, and consequent lack of replacement needs, they did not encourage the large-scale development of new prothalli except when they had new regions to colonise. The young matured swiftly, and received an education evidently beyond any standard we can imagine. The prevailing intellectual and aesthetic life was highly evolved, and produced a tenaciously enduring set of customs and institutions which I shall describe more fully in my coming monograph. These varied slightly according to sea or land residence, but had the same foundations and essentials.