The immediate object of the present paper is to place on record the history and characters of several Atacama meteorites of which no description has yet been published; but incidentally it is convenient at the same time to consider the relationship of these masses to others from the same region, which either have been already described, or at least are stated to be preserved in one or more of the known Meteorite-Collections.

In the New Red breeciated conglomerate of the coast of South Devon there are numerous fragments of Devonian limestone, on the weathered exterior of some of which botryoidal and concentric chalcedony is commonly found. There does not seem to be anything in the nature of the material to call for a new name from a mineralogical point of view; but, as the ettalcedonic shells to be described are peculiar in their mode of occurrence and form and are locally called Beekites, and the mineral is commonly spoken of as Beekite, after Dr. Beck, Dean of Bristol, who first called attention to it, I will use the word where convenient.

In a late number of the Magazine I mentioned that I had obtained from several of the Treshinish Islands specimens of gyrolite, and that one of these carried crystals which seemed sufficiently perfect for the determination of the form of the mineral.

A careful examination of the specimen showed it to be somewhat fragile; and, as we know that the mineral is itseff excessively tender as well as soft, I thought it desirable that the most should be made of so unique an example.

Several years ago Dr. Thomas Aitken, of Inverness, put into my hands a mineral which he thought to be new, with the request that I would analyse it.

He stated that the mineral occurred in veins in the conglomerate of the Old Red Sandstone, near Loch Bhruithaich, in Inverness-shire ; that it had been found by and given to him by the head gamekeeper on the Lovat property, and that similar pieces had been given to Mr. Wallace.

The specimens which he put in my hands, and others which he showed me, consisted of one side of a vein-plug, and were formed of alternate bands of foliated flesh-coloured baryte, with narrower ones of the substance in question.

The following new localities for these t~ree rare minerals have lately come under my notice.

I was some time ago presented by George Moodie, Esq., formerly Surveyor-General to the Transvaal Government, with a specimen which he obtained himself from the lead mines at Marico Zeerut, near Potsehefstroom, in the Transvaal.

This specimen was part of a small druse which is lined with crystals in a corded arrangement. These crystals appear to me to be zinc carbonate.

Superimposed thereon there are crystals of both linarite and of caledonite, and also minute crystals of an emerald-green mineral which is unknown to me.

There being but one specimen, I do not desire to remove any of the last for testing.

At a meeting of the Cambridge Philosophical Society on May 20th, Mr. Robinson read a preliminary paper "On the formation of Struvite by Micro-organisms."

"The author had observed the formation of fine well-formed crystals in many tubes of nutrient gelatin and agar-agar, in which he was growing pure cultivations of various micro-organisms."