390 Transactions of the Canadian Institute. [Vol. VII. 



reflections diminish the brilliancy of the image, and it is preferable to 

 seal the components in optical contact with Canada balsam. Although 

 this is a disagreeable and troublesome process, one is amply repaid by 

 the superior brilliance of the slides. These may be viewed in the hand 

 or projected by an ordinary lantern similarly to the regular slides and 

 require no special care in their handling. 



The natural colour slides made by the writer, some twenty in 

 number, embrace reproductions of the spectrum, colour charts, and 

 coloured pictures ; flowers, and fruit ; views around the University and 

 some other subjects. These, which can now be exhibited, illustrate 

 fairly well the capabilities of the process [^Slides shown]. Many 

 instances, in which a slide in the natural colours, if obtainable, would 

 prove of very great value, will at once suggest themselves and the 

 process has now reached the stage where any such slides can be made ; 

 and the further simplification of the details ought to render such slides 

 a regular commercial product. 



The three-colour process is an indirect, and, to a certain extent, 

 cumbersome method, and not at all what is usually looked for in colour 

 photography. The ideal process would be such that a photograph in 

 colours could be produced similarly to, and with little more trouble 

 than a photograph in monochrome. This problem, however, seems no 

 nearer a practical solution than it has for the last twenty or even fifty 

 years, and there is no process at present in sight which holds out any 

 hope of realizing such an ideal. But, in consideration of what has 

 already been accomplished in science and the arts, he would be foolish 

 who would venture to put a limit to man's achievements in this or any 

 other branch of science. 



