Dissolve and pour into an earthen or gutta-percha dish. Take the paper (cut to the proper size) and _float_ it on this solution for about three minutes; care must be observed that there are no air-bubbles between the solution and the paper, for this would cause spots. It now can be hung up to dry, and as soon as dry it may be used. Let me here repeat, that this operation must be conducted in a dark room. _Fixing and Toning Bath._--I find that a better effect is produced if the positive be a little over-printed before being acted upon by the following mixture:-- Distilled water 8 ounces. Chloride of sodium 240 grains. This solution should be put into a flat dish and the print placed on it, face down, for from one and a-half to three minutes, when it should be taken off and put into the following solution, and allowed to remain there from three quarters of an hour to two hours:-- Distilled water 18 ounces. Hyposulphite of soda 3 ounces. Nitrate of silver 60 grains. The following method should be observed in preparing this last mixture, viz.:--dissolve the three ounces of hyposulphite of soda in _sixteen_ ounces of the water and the sixty grains of nitrate of silver in the remaining two ounces; then pour the nitrate of silver solution into that containing the hyposulphite of soda, stirring the mixture continually until all is well mixed. After the print has remained in the toning solution for the specified time, it should be taken out and well washed in several changes of clean water, and dried and mounted in any of the usual ways. With a few general remarks I will close this, perhaps, too long communication. It should be a point in the practice of every one who desires success in any process, to maintain a strict observance to cleanliness; this is one point in which most persons fail, and it cannot be too strongly impressed upon the minds of manipulators. It should be understood that the foregoing process is _complete in itself_, and is not to be confounded with any other method. The _collodion_ is adapted for the _nitrate of silver bath_, and the _bath_ for the _collodion_; and no one should use other preparations of collodion and silvering solution, except they do so with the full expectation that it will be at the _loss of either or both of the preparations employed_.