In every branch of Natural Science there are earnest zealous workers, whose life-long devotion, to; its cause entitles them to be warmly remembered and even beloved, especially when their labours have been protracted over more than half a century; so long indeed, that to many of the scientific youth of the present day they are only known by name.

We called attention to Part ii. of the Fifth volume of the Journal of this Society in our December number. We have just received the first part of the sixth volume, and are glad to find that the subject of Agricultural Geology once more finds a place in its pages, and that the Secretary, Mr. Jenkins, is again its advocate and exponent. In the present part, Mr. Jenkins applies his geological training to an exposition of the surface-geology of Belgium, whither he had gone in the latter part of the summer of 1869 to report on the Agriculture of that kingdom, accompanied by Dr. Augustus Voelcker, the Society's chemist.

In the British Museum there is the right ramus of the mandible of a young Palœotherium magnum, obtained by M. Bravard from the Eocene strata of Vaucluse, which possesses a peculiar interest, inasmuch as the three principal milk molars are completely cut, though their unworn crowns show that they have not long been, in place. The ramus itself must have been nearly eight inches long when it was complete, while the distance from the articular surface of the condyle to the lower margin is about 3·25in. The symphysial surface is oval, rugose, and extends back nearly as far as the anterior margin of the crown of the first visible grinder; the anterior, or mental region of the ramus, is inclined upwards and forwards, and is slightly convex, as in all the true Palœotheria. In front of the most anterior milk molar which is in place, there is an oval fossa about 0·2in. long, which appears to lead into the alveolus of the proper first milk molar (dm1); and further forward (but not more than 0·2in., so that the diastema of the milk teeth must have been exceedingly short) a series of depressions on the truncated anterior end of the ramus represent the bottoms of the alveoli of the canine and incisors.

In the February number of the Geological Magazine is a revised list of the Cretaceous Entomostraca, described and figured in my Pal. Soc. Monograph of 1849; and I now propose to offer a revision of the Tertiary Entomostraca published in my Pal. Soc. Monograph of 1856. The general observations on the subject offered in February will hold good in this instance also. A corrected list of the generic and specific names is appended; and to this the numbers in the following notes refer.

In the Geological Magazine for March last, Vol. VI., p. 115, I gave a short account of the discovery of Olivine and its pseudomorphs in the igneous rocks of the South Staffordshire Coal-field, and as I have since then made a microscopical examination of similar rocks from the surrounding district, I am induced to offer the following observations.

The valuable paper by Professor Harkness on the Middle Drift deposits of Great Britain does not include a notice of their occurrence in Cheshire. About six years ago, a paper of mine on this subject was published in the Reports of the Geological Society of Manchester. I revert to it again, inasmuch as the only locality little dwelt on by Professor Harkness bears out so thoroughly the chief peculiarity about the beds in question.

The following interesting communication relating to this wonderful line of Railway (forming part of a letter from F. B. Meek, Esq., of the Geological Survey of Illinois, U.S.A., to Dr. J. J. Bigsby, F.B.S., author of the Thesaurus Siluricus), has been forwarded to us for insertion by the kindness of Dr. Bigsby.

In the February number, 1870, page 79, line 9 from top, erase Graptolitidœ.

In the February number, 1870, page 79, line 12 from top, for pusillus read putillus.

In the March number, Glasgow Geological Society's Reports, page 139, line 20 from top, for inner read outer.

In the March number, in Mr. Scrope's article on Lavas, page 104, line 14 from foot of page, for silver read silica.