(2) With regard to these stones, however, there is much confusion and difference of opinion. The arrangement adopted in the table here given is that of CORNELIUS AGRIPPA (_Occult Philosophy_, bk. ii.). A comparatively recent work, esteemed by modern occultists, namely, _The Light of Egypt, or the Science of the Soul and the Stars_ (1889), gives the following scheme:-- {}=Amethyst. {}=Emerald. {}=Diamond. {}=Onyx (Chalcedony). {}=Agate. {}=Ruby. {}=Topaz. {}=Sapphire (skyblue). {}=Beryl. {}=Jasper. {}=Carbuncle. {}=Chrysolite. Common superstitious opinion regarding birth-stones, as reflected, for example, in the "lucky birth charms" exhibited in the windows of the jewellers' shops, considerably diverges in this matter from the views of both these authorities. The usual scheme is as follows:-- Jan.=Garnet. May =Emerald. Sept.=Sapphire, Feb.=Amethyst. June=Agate. Oct. =Opal. Mar.=Bloodstone. July=Ruby. Nov. =Topaz. Apr.=Diamond. Aug.=Sardonyx. Dec. =Turquoise. The bloodstone is frequently assigned either to Aries or Scorpio, owing to its symbolical connection with Mars; and the opal to Cancer, which in astrology is the constellation of the moon. Confusion is rendered still worse by the fact that the ancients whilst in some cases using the same names as ourselves, applied them to different stones; thus their "hyacinth" is our "sapphire," whilst their "sapphire" is our "lapis lazuli". Certain herbs, culled at favourable conjunctions of the planets and worn as amulets, were held to be very efficacious against various diseases. Precious stones and metals were also taken internally for the same purpose--"remedies" which in certain cases must have proved exceedingly harmful. One theory put forward for the supposed medical value of amulets was the Doctrine of Effluvia. This theory supposes the amulets to give off vapours or effluvia which penetrate into the body and effect a cure. It is, of course, true that certain herbs, _etc_., might, under the heat of the body, give off such effluvia, but the theory on the whole is manifestly absurd. The Doctrine of Signatures, which we have already encountered in our excursions,(1) may also be mentioned in this connection as a complementary and equally untenable hypothesis. According to ELIHU RICH,(2) the following were the commonest Egyptian amulets:-- 1. Those inscribed with the figure of _Serapis_, used to preserve against evils inflicted by earth. 2. Figure of _Canopus_, against evil by water. 3. Figure of a _hawk_, against evil from the air. 4. Figure of an _asp_, against evil by fire. PARACELSUS believed there to be much occult virtue in an alloy of the seven chief metals, which he called _Electrum_. Certain definite proportions of these metals had to be taken, and each was to be added during a favourable conjunction of the planets. From this electrum he supposed that valuable amulets and magic mirrors could be prepared.