562 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Abbe. E. — The Kelation of Aperture and Power in the Microscope. 



This Journal, ii. (1882) pp. 300-9. 

 Engl. Mech., XXXV. (1882) pp. 374-5. 

 " Akakia." — Microscopy — Wide-angle Objectives. 



Engl. Mech., XXXV. (1882) p. 283. 

 „ Microscope Power. 



[Reply to " Antares," infra, as to the non-increase of aperture of some 

 oil-immersion objectives over the figures shown with Abbe's Aperto- 

 meter when water is used as the immersion fluid. An oil-immersion, 

 if of ouly 1 - 25 N.A., will show that aperture with water, as it is below 

 the maximum 1 ■ 33. Substituting oil cannot increase the reading, as 

 the maximum aperture of the lens has been already measured.] 



Engl. Mech., XXXV. (1882) pp. 309-10. 

 American Society of Microscopists. 



[Review of ' Proceedings ' of 4th Annual Meeting at Columbus, O.] 



Amer. Natural, XVI. (1882) pp. 343-6. 

 [Circular of the President, Dr. G. E. Blackham, as to the Elmira Meeting 

 in August 1882, and Letters from him and Dr. Up de Graff. Also 

 circular as to proposed Quarterly Journal of Microscopy, &c] 



The Microscope, II. (1882) pp. 47-8, 85-7, 91. 

 " Antares." — Microscope Power. 



["Partial statement ... of the details of magnifying power provided by 

 an ordinary well-furnished instrument of full size."] 



Engl. Mech., XXXV. (1882) pp. 261-2. 

 „ The Apertometer — Lantern Objectives. 



[Reply approving of the explanation given in " Akakia's " letter, supra, 

 and account of further experiments with objectives. Also remarks on 

 the Apertometer and Aperture-measuring. A query to Mr. Shrubsole 

 as to Lantern Objectives.] 



Engl. Mech., XXXV. (1882) p. 429. 

 Bale, W. M. — On Recent Improvements in Microscopy. 



[Deals with objectives, illuminating apparatus, stands, stages, swinging 

 tail-pieces, this Journal, &c] 



Southern Science Record, II. (1882) pp. 75-80. 

 Beale's (L. S.) Microscope in Medicine. 4th ed. 



[Review, with extended remarks on the germ theory of disease.] 



Amer. Natural, XVI. (1882) pp. 500-4. 

 Bowman, F. H. — The Structure of the Cotton Fibre in its relation to Technical 

 Applications. 2nd ed. 



[Contains description of Microscope and Micrometers, pp. 7-14, and note 

 on the "Limit of Microscopic Vision," p. 157.] 



8vo, Manchester, 1882, xvi. and 211 pp. (5 figs, and 12 pis.). 

 Bots, C. V. — Measurement of Curvature and Refractive Index. 



Engl Mech., XXXV. (1882) pp. 469-71, from ' Philosophical Magazine.' 

 Bradbury, W. — The Achromatic Object-Glass. I.-VI. 



[Deals with "the theoretical conditions that must be satisfied in the 

 formation of an object-glass."] 

 Engl. Mech., XXXV. (1882) pp. 297-8, 344, 371-2, 393, 418-9, 440-1. 

 Brittain, T. — The Beginnings of Microscopic Study. 



[Brief general history of the simple and compound Microscope and 

 Leuwenhoeck's observations.] 



Field Naturalist, I. (1882) pp. 7-8. 

 Bulloch, "W. H. — Iris Diaphragm for Use above an Objective. 



[Claims to have been the first to introduce it, and refers to his Catalogue 



of 1878. 

 J. W. Sidle subsequently writes referring to Dr. Royston-Pigott's previous 

 description of such an apparatus.] 



Amer. Mon. Micr. Journ., III. (1882) pp. 99, 117-8. 

 Bdlloch's (W. H.) Apparatus for Measuring the Magnifying Power of 

 Oculars. \_Post.~\ 



Amer. Mon. Micr. Journ., III. (1882) pp. 103-4 (1 fig.). 

 The Microscope, II. (1882) pp. 83-4. 



