24 THE MICROSCOPE. [February, 



timed it can safely be started with the developer which has been 

 used several times, and has thus become somewhat weakened. 



We will now proceed to describe the several steps in develop- 

 ing the picture, using the hydrochinon developer. 



The negative is removed from the plate-holder by the light of 

 our ruby lantern only. A sufficient amount of the developer is 

 poured over it in a small tray to cover the negative to the depth 

 of about one-fourth inch. The tray should be rocked back and 

 forth pretty constantly, and the image watched for its appearance. 

 If the proper time has been given to it, the image will begin to 

 appear in about three to five minutes (much sooner with pyro 

 developer) , and continue to develop until the details are all to be 

 seen. If at this time we hold the negative up so that we may 

 look through it, the picture will appear quite thin, and as the 

 next bath fades it still more, were it now fixed we should have a 

 very thin negative to print from. So we will return it to the 

 hydrochinon bath, and leave it there until the image has ap- 

 parently sunk quite out of sight or until upon close inspection 

 in the tray only a faint outline of the high-lights is to be seen, 

 then pour off the developer for future use, and after washing the 

 negative several times in running water it is placed in the hypo 

 bath or fixing solution. 



At this time we may put another negative in the plate-holder 

 and leave the dark room for a short time. Allow the negative to 

 remain in the fixing bath for one or two minutes after it has 

 cleared and then place in running water for an hour or in a pail 

 of water for four or five hours, chansrins: the water two or three 

 times. It is then to be stood upon end and allowed to drain, be- 

 coming perfectly dry, when it may be flowed with varnish before 

 we attempt to print from it. 



I have used the sensitized albumen paper and toned the pic- 

 tures with gold chloride, but the method, although producing 

 excellent pictures, is somewhat lengthy and troublesome. 



Many operators, not caring to go through with the process, send 

 their negatives away for the printing and finishing of the picture. 

 So for simplicity and good results I would recommend the Omega 

 paper and Omega toning solution. With these any one can fin- 

 ish a fair picture in a short time and thus know the result of his 

 labor immediately. Specify the size of negative in ordering and 

 thus save the bother of cutting the paper. A one-pint bottle of 

 the solution will tone and fix many prints, and the solution may 

 be used over and over again until exhausted. The directions for 

 printing and using the solution accompany the packages, so that 

 it is not necessary for me to give them here. 



I have refrained from giving formulae for all of this work be- 

 cause the formulae which I have found printed in works upon 

 photography I have not followed, but I have used those only that 



