Make a very dilute solution of sulphuret of potassium, put it into any old gutta-percha or porcelain bath; and, after the negative is developed as far as is desirable with the ordinary iron developer, fixed, and washed in the usual way, immerse the plate in that state at once into the solution of sulphuret of potassium, in the same manner as in sensitising the plate in the nitrate bath, by using a dipper, and leave it there until sufficiently intense, which is generally in about the time required for coating and sensitising another plate, so that, if the operator be working single-handed, very little, if any, time is lost in the process of intensifying. The solution may also be flooded over the plate in the same manner as the developer, after fixing and washing as before. When sufficiently intense, rinse the plate with water, dry, and varnish in the ordinary way. But it is best to use the intensifier in the manner first described, which is by far the most cleanly and economical plan, both in the saving of time and solution. By using it with the "bath and dipper," it is not offensive, on account of its extreme dilution, and not being disturbed so much, or immediately under the olfactory nerves of the operator, it may be worked in the ordinary dark room with the greatest safety and convenience. A STRING OF OLD BEADS. He is a rash man who announces "something new" in these days. I believe there is nothing new under the sun, and in photography especially. If any man be rash enough to rush into print with what he considers a new idea, some other man rushes into print also and says the idea is old, exploded, useless, worthless, or worse. I lay no claim to originality. I have lived so long in the atmosphere of photography, I don't know where or how I picked up my knowledge--such as it is. Some of it I may have stumbled on, some of it I may have found, and some of it I may have stolen. If the latter, I forget from whom, when, or where, and in all such cases a bad memory is a good and convenient thing. But I will endeavour to atone for such sins by publicly restoring all I may have filched from other men's brains for the benefit of all whom it may concern. I shall not count the beads; that would be like running over a rosary, and I object to sub rosa revelations; neither shall I attend to the order of stringing the beads, but will put them on record just as they come to hand; and the first is--