304 THE AMERICAN MONTHLY [Nov., 



16. Oblique illuminator. 



17. Solid catoptric ocular. 



18. Erecting aplanatic system eyepiece for telescope. 



19. Short focus, quadruple cemented object glass for teles- 

 cope. 



20. Clinical stage mounted on end of objective as suggested 

 by E. Cutter. 



21. Trunnion joint to compensate for wear in stands. 



During most of his residence in Boston, Mr. Tolles was a val- 

 etudinarian. He showed many signs of nervous prostration, 

 and after death was found to have diseased lungs and pleura. 

 Though rich in good works that conferred international fame, 

 still he was deprived of the wealth that the richness of his re- 

 sources of inventive skill should have brought. He received no 

 reward such as his contemporary, Mr. Alvin Clarke, received 

 for making the most powerful telescopic objective of his time; 

 to wit, a Rumford medal. Certainly it seems as if the maker of 

 the most powerful microscopic objective, was worthy of the 

 same reward as the maker of the most powerful telescope. 



[Notp:. — After this paper had been read, on a table before all, 

 tlie B. microscope stand of Tolles was unpacked from its closed 

 box, its parts described, the 1-75 and A. eyepiece were mounted 

 and some red blood corpuscles were focussed. The illumination 

 was from a coal oil lamp with an indestructible and never trim- 

 med clay wick. This wick is the invention of Mr. J. T. Mur- 

 ray of New York, a former partner of Edison. About 25 per 

 cent more illumination is had with this clay wick than with cot- 

 ton. In turn all the audience then saw through this objective. 

 Being the first and only time that the one-seventy -fifth and the 

 clay wick had been used in a medical college, it is not strange 

 that a Boston teacher of medical microscopy has since said that 

 there was no one-seventy-fifth inch objective ] 



Bubbles in Media.— Place the bottle in a pan of hot water 

 until the bubbles rise and disappear. 



White's Objects.— Those that I have mounted are beauties 

 and I want 15 more of the cross sections. I think the scheme a 

 line one. The staining, cutting, and preservation are all to be 

 commended. — W. G. B. 



