300 SUMMARY OF OUERENT EE8EABCHE8 RELATING TO 



work, render possible a still greater exactness of the mathematical 

 forms which theory seeks to realize, and the art of glass-making may in 

 the future produce new materials instead of those now used, which, in 

 their optical properties, may offer more favourable conditions for the 

 construction of perfect objectives than our present crown and flint- 

 glass. Doubtless united efforts in this direction will result in a con- 

 tinual progress towards perfection of construction, which will bring 

 great benefits to the scientific application of the Microscope, if even 

 it does not increase the absolute capacity of performance of the 

 instrument. 



In this direction lie the ends attainable. Efforts grounded on a 

 fundamentally different aspect of the question will be thwarted in 

 the future, as in the past, by the barriers which nature opposes to 

 human illusions. 



Webb's ' Optics without Mathematics.' * — The author of this work 

 makes the astonishing statement that " the magnifying power of the 

 Microscope is more frequently given in superficial measure ! " though 

 he considers that " it is better for our purpose to reckon it in the 

 linear form." 



Beneckb, B. — Die Anwendung der Photographie zur Abbildung mikroskopischer 

 Objecte. (The use of photography for representing microscopic objects.) 

 [Summary of recent papers on the subject by T. 0. White, W. H. Walmsley, 

 G. J. Johnson, E. Hitchcock, C. Kiar, &c.] 



Zeitschr.f. Wiss. Mikr., I. (1884) pp. 109-13. 

 BOTTEBILL, 0. — Protoplasm. (Presidential Address to the Liverpool Micro- 

 scopical Society.) 



Micr. News, IV. (1884) pp. 57-68. 

 Bbadbuby, W. — The Achromatic Object-glass, XXX. 



Engl. Meek., XXXVIII. (1884) pp. 485-7. 

 , „ „ XXXI. Littrow's Formulae. 



Engl. Mech., XXXIX. (1884) pp. 6-7. 

 " Brass and Glass," A night with. 



FEeport of Meeting of Western Microscopical Club.] 



Engl Mech., XXXVIII. (1884) pp. 513-4. 

 Bulloch, W. H. — The Congress Nose-piece. 



[Eeply to A, McCalla infra, agreeing that he suggested the idea, " but it is 

 one thing to suggest an idea and another to put it into practical shape."] 

 Amer. Mon. Micr. Journ., V. (1884) pp. 58-9. 

 0., J. D. — New Eye-piece Micrometer. lPost.2 



Amer. Mon. Micr. Journ., V. (1884) p. 52. 

 D., E. T. — Graphic Microscopy. , 



II. Eyes of Epeira conica. ., 



HI. Palate of Limpet. 



Sci.-Gossip, 1884, pp. 25-6 (1 pi.); pp. 49-50 (1 pi.). 

 Dallinger's (Eev. W. H.) Nomination to the Chair of the Society. 



Journ. of Science, VI. (1884) p. 118. 

 DiPPEL, L. — Mikrographische Mitt heilun gen. (Microscopical Notes.) 



[(1) The formula for a on p. 312 of his ' Handbook of General Micro- 

 scopy.' (2) Eemarks on some test-objects of the genus Grammatophora, (3) 

 Correction-adjustment with homogeneous immersion objectives.] \^Post.'] \ 

 Zeitschr. f. Wiss. Mikr., I, (1884) pp. 23-33 (1 fig.). 

 Edison Electric Lamp, Homologous sections and molecules. 



Micr. Bull, I. (1884) p. 14. 



* See Bibliography, infra, p. 303. 



