"It is written in a very clear and lively style, and contains a great deal of curious historical matter concerning the rise and gradual increase of the Pope's power over temporal princes: the prohibition of marriage in secular priests; the doctrine of transubstantiation; the institution of auricular confession to a priest; the institution of Orders of preaching friars; and the institution of Universities and Schools of Disputation; (all which institutions, he observes, had a tendency to increase the power of the Pope, and were made for that purpose,) which is set forth in pp. 467, 468., &c., to p. 472. And much other interesting matter, concerning the sentiments of the Presbyterian ministers, the Papists, the Independents, and other sectaries. The pretensions made by them to Spiritual Power, and the nature of heresies and the history of them, is clearly and justly described in another part of it; over and above the narration of the several events of the civil war itself, which I believe to be faithful and exact in point of fact, though with a different judgment of Mr. Hobbes as to the moral merit of the persons concerned in producing them, from that which, I presume, will be formed by many of the readers of this history at this day; which difference of judgment between Mr. Hobbes and the present readers of this work, will be a necessary consequence, from Mr. Hobbes's having entertained two very important opinions concerning the nature of civil government in general, and of the monarchical government of England in particular, which in the present age are thought, by almost every Englishman who has paid any attention to the subject, to be exceedingly erroneous." Subjoined to his reprint of this tract, the Baron has appended remarks on some particular passages therein, which appeared to him to contain erroneous opinions. C. H. COOPER. Cambridge. * * * * * PHOTOGRAPHIC CORRESPONDENCE. _Photographic Slides for the Magic Lantern._--Might not the collodion process be applied very usefully in the preparation of slides for the magic lantern? Good slides are always expensive, owing, in great measure, to the accuracy required, where every defect will be magnified some hundred times. I would suggest that a photographic picture should be taken on the glass plate, and then varnished. The painter should then apply his colours to the _opposite_ side of the glass, using the photographic image as his outline. The colours would then be burnt in, and the varnish and collodion film cleared off. This plan would be especially useful when the photographic picture had been taken by the microscope. THOS. SCOTT, B.A. Brighton.