ZOOLOGY AND BOTANY^ MICEOSCOPY, ETC. 44.1 



turn hinged to the top. The sides are tongued to fit into grooves in the 

 top and front. Some small shelves are arranged against the back."] 



Amer. Mon. Micr. Journ., IV. (1883) p. 78. 

 MooBE, A. Y. — Testing Microscope Objectives. 



[Bad centering and bad form tested by the mercury globule. Chromatic and 

 spherical aberration by the mercury globule, a diatom, or Podura scale. 

 Aperture by graduated rotating base or swinging substage bar. Flatness 

 of field by ^cAmws-spine and blood-corpuscles. Also working distance 

 and magnifying power.] 



Amer. Mon. Micr. Journ., IV. (1883) pp. 52-5. 

 Mokrison's ("W. J.) New Lamp-shade. 



[Instead of the ordinary porcelain shade, a similar conical shade of tin is 

 provided, having a cylinder extending nearly to the top of the chimney. 

 A similar conical shade (without any chimney however) extends down- 

 ward from the shade ring so that the light is entirely confined by the two 

 cones — except what reaches the ceiling from the chimney. The lower cone 

 has an opening of suitable shape and size to allow the light to be directed 

 upon the mirror.] 



A'iner. Mon. Micr. Journ., IV. (1883) pp. 63-4. 

 Paek, R. — The Electric Light in Surgical Diagnosis. {_Su'pra, p. 421.] 



Knowledge, III. (1883) pp. 281-2 (1 fig.), 

 from Ann. of Anatomy and Surgery and Scientific American. 

 Powell and Lbaland's l-12th in. Homogeneous-immersion Objective. 

 lAnte, p. 320.] 



Engl. MecL, XXXVII. (1883) p. 104. 

 "Prismatique." — Object-glass "Working. V. 



Engl. MecL, XXXVII. (1883) pp. 99-100 (1 fig.). 

 Reddots, C. — On Objectives. 



[As to " the difference in results between first quality and |15 lenses," and 

 comment by Editor.] 



Amer. Mon. Micr. Journ., IV. (1883) p. 78. 

 Rogers (W. A.) on the Visibility of Ruled Lines. [Supra, p. 439.] 



Ame}\ Mon. Mia: Journ., IV. (1883) pp. 45-6. 

 „ „ A Correction [of two or three errors in his paper on the 

 " Conditions of Success in the Construction and the Comparison of Standards 

 of Length."] 



Amer. Mon. Micr. Journ., FV. (1883) pp. 78-9. 

 " Roi ne puis, Souza je suis." — Grunow's new Camera-lucida. 

 [Described ante, p. 120, and supra, p. 423.] 



Engl. Mech., XXXVII. (1883) p. 154 (1 fig.). 

 SoEET, C. — Sur un refractometre destine a la mesure des indices et de la disper- 

 sion des corps solides. (On a Refractometer for measuring the refractive 

 indices and dispersive powers of solid bodies.) 



Comptes Rendus, XCV. (1882) pp. 517-20. 

 Abstr. in Zeitschr. f. Instrumentenk., II. (1882) pp. 414-5. 

 Stowell, C. H. — Our new l-50th Objective. 



[Made by Spencer — fom* systems — 1'17 N.A. Working distance about 

 1-lOOth in. Used with homogeneous-immersion fluid, glycerine or 

 water,] 



The Microscope, III. (1883) pp. 14-15. 

 Thomas, B. W. — Resolving AmpMpleura peUucida with central light. 

 [Accompanying letters from H. J. Detmers and S. A. Forbes.] 



The Microscope, III. (1883) pp. 9-12. 



