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July 11,1862.] THE PHOTOGRAPHIC NEWS. 333 Zrd Formula. Alcohol at 42° 400 Ether at 62° ... ... ... ... 600 Pyroxylins ... 10 Iodide of ammonium 6 Iodide of cadmium ... ... ... 4 Bromide of ammonium ... ... 1’5 Bromide of cadmium . ... ... 1’5 Iodine ... ... ... ... 05 The results obtained with this collodion are extremely delicate. In the above three formula) for collodion, the proportion of bromides and iodides differ. The first formula must bo employed with a good light; it will not fog : the second with a medium light: the third may be employed when the light is weak. This collodion is strong in bromides, and well adapted for giving all the details of a feebly illuminated model. It fogs if the light be too strong. For Spring Operations. At a Medium Temperature. lst Formula. Alcohol at 42° . ... ... ... 500 Ether at 62° 500 Pyroxyline ... ... ... ... 10 Iodide of ammonium . ... ... 5 Iodide of cadmium . ... ... 5 Bromide of ammonium ... ... 1 Bromide of cadmium 1 Iodine ... ... ... ... .. 05 2nd Formula. • Alcohol at 42° . ... ... ... 500 Ether at 620 . ... ... ... 500 Pyroxyline . ... ... ... 10 Iodide of ammonium . ... ... 5 Iodide of potassium ... ... ... 5 Bromide of ammonium ... ... 05 Bromide of potassium . ... ... 0-5 Iodine . ... ... ... ... 0-5 The silver bath must bo of the strength of 8 per cent, bis collodion will suit a strong light Fob Summer Operation. At High Temperature. Alcohol at 52° . ... ... ... 400 Ether at 62° . ... ... ... 600 Pyroxyline . ... ... ... 8 Iodide of ammonium ... 5 Iodide of cadmium ... ... ... 3 Bromide of ammonium ... ... 05 Bromide of cadmium... ... ... 0 2 Iodine ... 0-3 The silver bath must be 7 percent. During very hot "SAther the silver bath must be 6 per cent. This collodion gives very fine pictures : it may be used "ith a strong light The Silver Bath. '^position of the Silver Bath according to the Season and the Temperature.—In Winter. Water ... ... ... ... ... 100 Nitrate of silver 10 In Svring and Autumn. Water... ... J 100 Nitrate of silver 8 Developing Solution. Water ... 1000 Sulphate of iron ... ... ... 40 Acetic acid 40 Strengthening Solution. Water 100 Nitrate of silver 3 Acetic acid . 3 Another Formula. Distilled water ... ... ... 500 Pyrogallic acid ... ... ... 4 Acetic acid... ... 40 For strengthening. The same solution as above. Fixing. Water 500 Hyposulphite of soda... ... ... 50 When the negatives have been exposed too long, and have a grey, feeble, and foggy aspect, they may be strengthened, after fixing, with the following solution :— Water 1000 Bichloride of mercury ... ... 3 Hydrochloric acid ... ... ... 6 Chloride of gold ... ... ... 1 Varnish. Benzine ... ... ... 100 White picture varnish . 15 Another Varnish. Benzine ... ... ... ... 100 Copal ... ... 7 PHOTOGRAPHY FOR TRAVELLERS AND TOURISTS. BY PROFESSOR POLE, F.R.S.* It is the natural wish of most persons who visit a new locality to bring back pictorial representations of the scenery ; and this want is usually met in one of two ways—either by published views or by sketching. In well-frequented places, published views are generally to bo had, and command a large sale ; and the accuracy of these publications has of late been much increased, and their circulation much promoted, by the more general in troduction of landscape photography, and the great increase of its professional practitioners. But the facility of obtaining views in this way is not without its drawbacks. In the case of engravings, both the accuracy and artistic merit may be anything but satisfactory; ordinary photographs, though they must be tolerably true, may not re present the particular objects, or show them in the particular way the purchaser may desire ; and it need hardly be said that there are vast numbers of localities visited by both travellers and tourists, particularly the former, where neither engravings nor photographs are to be found, and of which it is, for that very reason, most peculiarly desirable to get accurate views. To meet these difficulties, the only resource has usually been hand-sketching. Now, the power to sketch well is undeniably one of the greatest advantages that a traveller can possess; but, unfortunately, though drawing is now one of our stock school accomplishments, only a small minority of those who travel are able to transfer efficiently to paper what they see ; and even in favourable cases, though clever and artistic pictures may bo produced, the faithfulness of the representations must always bo more or less uncertain. Doubtless, the idea must often have occurred to almost every traveller, what an advantage it would be if he could himself take photographs, where ho likes, of what ho likes, when ho likes, and how ho likes. But such an idea must soon have been dismissed, from the supposed incompatibility of this with ordinary travelling arrangements. The usual notions of pho tographic operations comprehends a fearful array of dark rooms, huge instruments, chemical paraphernalia, water, and mess, which no sane person, out of the professional photographic guild, would think of burdening himself with, on an ordinary journey, and which only a practised adept could use if he had them; and so the idea of a traveller taking views for himself on his tour is generally dismissed at once as an impracticable chimera. Now, it is the object of this article to show that such a view of the matter is a delusion, and that any traveller or tourist, gentleman or lady, may, by about a quarter of an hour’s learn ing, and with an amount of apparatus that would go into the gentleman’s coat pocket, or the lady's reticule, put himself or herself into the desirable position wo have named. * From Macmillan's Magazine.