In an Essay on the Assyrian "Grove" and other Emblems, Mr. John Newton sums up the basis of this symbolism as follows: "As civilization advanced, the gross symbols of creative power were cast aside, and priestly ingenuity was taxed to the utmost in inventing a crowd of less obvious emblems, which should represent the ancient ideas in a decorous manner. The old belief was retained, but in a mysterious or sublimated form. As symbols of the male, or active element in creation, the sun, light, fire, a torch, the phallus or lingam, an erect serpent, a tall straight tree, especially the palm or fir or pine, were adopted. Equally useful for symbolism were a tall upright stone (menhir), a cone, a pyramid, a thumb or finger pointed straight, a mask, a rod, a trident, a narrow bottle or amphora, a bow, an arrow, a lance, a horse, a bull, a lion, and many other animals conspicuous for masculine power. As symbols of the female, the passive though fruitful element in creation, the crescent moon, the earth, darkness, water, and its emblem, a triangle with the apex downward, "the yoni"--the shallow vessel or cup for pouring fluid into (cratera), a ring or oval, a lozenge, any narrow cleft, either natural or artificial, an arch or doorway, were employed. In the same category of symbols came a boat or ship, a female date palm bearing fruit, a cow with her calf by her side, a fish, fruits having many seeds, such as the pomegranate, a shell, (concha), a cavern, a garden, a fountain, a bower, a rose, a fig, and other things of suggestive form, etc. "These two great classes of conventional symbols were often represented _in conjunction_ with each other, and thus symbolized in the highest degree the great source of life, ever originating, ever renewed.... A similar emblem is the lingam standing in the centre of the yoni, the adoration of which is to this day characteristic of the leading dogma of Hindu religion. There is scarcely a temple in India which has not its lingam, and in numerous instances this symbol is the only form under which the god Siva is worshipped." In _Ancient Sex Worship_ we read, "As the male genital organs were held in early times to exemplify the actual male creative power, various natural objects were seized upon to express the theistic idea and at the same time point to those points of the human form. Hence, a similitude is recognized in a pillar, a heap of stones, a tree between two rocks, a club between two pine cones, a trident, a thyrsus tied around with two ribbons with the end pendant, a thumb and two fingers. The caduceus again the conspicuous part of the sacred Triad Ashur is symbolized by a single stone placed upright,--the stump of a tree, a block, a tower, a spire, minaret, pole, pine, poplar or pine tree."