There should he no conditions to make this last rule objectionable. Great stress has been laid on the rare good judgment which should carry development to just the proper point and then check it. In my practice, the proper time to stop is when the iron ceases to act on the negative, and no sooner. - S. R. Stoddard.

I never fix my negatives until I return to my gallery. After developing and rinsing I flow them with glycerin and water mixed, about half and half, or enough water to make the glycerin flow evenly. There is not the slightest danger of their spoiling if they are not fixed for one week after. A good rinsing before fixing is all that is necessary. Redevelopment may be resorted to, or intensifying, as may be necessary. - J. C. Potter.

It has often happened in my practice, and no doubt in that of others, that the distant hills, indications of clouds, a stream of water, or a waterfall in a landscape, or a gentleman's white tie, the folds of a lady's dress, etc., are distinctly seen when the negative is first developed with the iron developer, but on redevelopment are lost, and become one unsightly patch of white in the print. This may be avoided in a great measure by the following plan. "When the details are well out with the iron solution, clear with cyanide, well wash the plate, and allow it to dry; then take a camel's - hair pencil, paint over the light to be preserved with

Gun Dammer,..................

30 grains.

BEnzole,..................

1 ounce.

This will dry instantly. Then proceed to redevelop the negative with pyro and silver in the usual way, previously using a dilute iodine solution. The pyro and silver will now only act upon the non-protected parts of the negative. Care must be taken to keep within the limits of boundary given by the lens, which is not a difficult matter, as the solution is easy to apply. - Thomas Gulliver.

310. I accoutre myself as follows:

Tent. - A very light tripod covered with two thicknesses of black calico, and one inner one of yellow. The calico is about twelve inches longer than the tripod, and when the legs are extended, I place a few stones upon this extra cloth, all around the inside of the tent, to steady it and keep out light. The cloth is also wider than required to cover the extended tripod, and, when I sit down inside, either upon my plate-box or on my heels, my assistant brings the cloth around me, overlaps it at one side, and keeps it there during development, etc. I find this tent the handiest for most subjects that ever I tried. When not in use the cloth is folded around the tripod, and the tent is then placed inside of the camera - tripod, and fixed with one leather strap and buckle. These (the tent and the camera-tripod) form one parcel of about ten pounds' weight, which I have often carried in my band two or three miles at a stretch. For country work, however, there can be nothing better or more easily in which case alcohol may be added, but more frequently the pyroxylin is in fault With different operators, the time daring which the plates may be kept in of the bath before use, varies extremely; it is a common complaint by operators that they cannot keep their plates more than a few minutes, whilst others keep them from a quarter of an hour to an hour and more, it the trouble ariaes from a repulsion between the film and the bath solution, it is evident that we must try to bring them nearer to each other in properties.

set up, and, if one lakes care to dampen it inside occasionally, I believe negatives more free from pinholes can be done in it than in any developing - box, and it is twice as portable.

Camera. - I have latterly used a sliding bellows - body camera, which takes plates seven by four and tbree - quarters, with two sliding fronts: one for single lenses when taking negatives the full size of the plate, and one for a pair of stereoscopic lenses, the flanges of the latter made to fit a half-a-dozen different sized lenses, by means of which are fitted on all the lenses except the largest pair. The box closes up to two and a half inches, and draws out to eight and a half, and it can be turned on end when taking upright views. It has also a removable centre division, which can be taken out when full-sized plates are used.

Lenses.. - The lenses consist of a triple and a single lens, each of eight inches focus; and stereoscopic, single and double, of six inches, four and a half inches, seven and a half inches, and two and a half inches focus. These I carry in leather cases, slung on a leather belt worn over the shoulder like a shot-belt.

Chemicals. - All my chemicals are put in sixteen - ounce bottles, and packed in baskets made for the purpose: a large one for carrying a stock, and a small one for holding sufficient for a day's work. The latter, when filled, contains three sixteen - ounce bottles of sensitizing bath, one of developer, the glass bath and dipper in a wooded case, eight two - ounce bottles of collodion, three two - ounce bottles of glacial acetic acid, one six - ounce bottle of cyanide solution, one dripping-bottle, one six - ounce bottle of crystals of sulphate of iron, one two-ounce bottle of crystals of cyanide, and a small glass funnel, one gutta-percha funnel, a plate-holder, a small portfolio holding filtering-paper, a dusting-brush, chamois leather, and two towels. All these go into a handy basket, which my assistant easily straps on his back, so that when we start to the field or mountain, I have the tent and camera-stand in one hand, my plate-box, containing twenty-four plates, in the other, with the lenses, in their cases over my shoulder. - George Washington Wilson.

It frequently happens during the hot summer months that we have to go out to take monuments, and sick or debilitated people, but find in such places no means of developing. Such has been my experience this summer, which led me to make some experiments in order to keep the collodion moist. I tried several means and ways to no purpose, until I tried the following: Pure glycerin, one ounce; condensed water, half an ounce; shake well, and after the plate is coated, drain, and wash with clean soft water until the greasy lines are nearly all gone; then poor over it the glycerin on and off, till all the lines are gone. Let it drain for a time, and place it in the shield. It will keep moist for three or four hours, with the thermometer at 104°; the time required is from fifteen to thirty seconds, according to light and stop used in the lens. I develop with iron, rather weak at first, twelve grains to the ounce; I use glacial acetic acid, two to twenty-four ounces, until it penetrates the