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THE PROJECTION MICROSCOPE 181 any traces of his actual instrument, or any record of its per- formance, or that it had ever come into use. This being so, however, I had to begin de novo, and lost much time by making my first experiments with diatoms. It was my friend Mr. T. Curties, F.R.M.S., who guided me out of that unprofit- able track, and gave me to understand that he should die happy if he could only see upon a screen, bright and sharp, ' the tongue of a blow-fly six feet long. That,' he said, ' is what we want.' As I knew already that I could give him more than double these dimensions easily, I was considerably relieved ; and the instrument was shortly afterwards com- pleted. It was first publicly exhibited at a meeting of the Eoyal Microscopical Society on Nov. 12, 1884, and again at the Quekett Club a few days later, to the entire satisfaction of the many experienced microscopists present on both occa- sions. 1 I shall content myself here with describing the projection- microscope as constructed by Messrs. Newton & Co. from my own designs, notwithstanding that since its introduction I have seen one or two others catalogued which are stated to perform well. I do not question this, but there are many reasons for the course here adopted. No such instruments were produced till some time after that here described ; 2 none have been demonstrated in the same public manner; none have come into nearly such general use or met with such in- 1 See Journal, R. M. S., December 1884, p. 1006, and Journal Quekett Mic. Club, March 1885, p. 118. 2 One exception ought to be made, in fairness, respecting a German in- strument. Particulars were published of a projection microscope designed by Dr. Hugo Schroeder, before my instrument was exhibited, though not till after it was completed. Dr. Schroeder's, which has been stated to perform excel- lently, was therefore worked out in perfect independence of mine, as mine was of his. With the exception of the concave parallelising lens presently described, which has been generally used, and is mentioned by Kingsley, there is, however, little in common in practical detail to the two instruments, and the cost of Dr. Schroeder's, which is far more complicated, was stated to be about 200Z.