ROY] 



794 



[ROY 



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12. [Sur 1'electrolyse des acides organiques.] 



Bordeaux, Mem. Soc. Sci. VIII., 1870, pp. v- 

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13. Experience sur le courant intrapilaire 



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Roys, (le Marquis) J. de. 13. Sur 1'argile plas- 

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14. Sur les terrains tertiaires des environs 



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15. Sur le diluvium gris. Paris, Bull. Soc. 



Geol. XXIV., 1867, pp. 841-842. 



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 380. 



17. Note sur la presence d'ossemeuts de 



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Royston-Figott, G. West. On high-power de- 

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2. The markings 011 the Podura scale. 



Monthly Microsc. Journ. III., 1870, pp. 13-14. 



3. On a new critical standard measure of 



the perfection of high-power definitions as 

 afforded by diatoms and Nobert's lines. 

 Monthly Miscrosc. Journ. III., 1870, pp. SOS- 

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4. On the optical advantages of immersion 



lenses and the use of deviation-tables for optical 

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5. On the advancing aplanatic power of the 



microscope, and new double-star and image 

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6. On aplanatic definition and illumination 



with optical illustrations. Monthly Microsc. 

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applied to microscopes, and its effects in 

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8. On certain imperfections and tests of 



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Royston-Figott, G. irest. 9. High-power de- 

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10. On an Aplanatic Searcher, and its 



effects in improving high-power definition in the 

 Microscope. Quarterly Journ. Microsc. Sci. X., 

 1870, pp. 393-396. 



11. On the history, refractions, definition, 



and powers of Immersion Lenses and new Re- 

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12. On a useful form of Dynameter 



Micrometer : the Kratometer. Monthly Microsc. 

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13. Striking velocity of cannon-balls. Po- 

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14. Researches on the errors of micro- 

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15. The advancing powers of microscopic 



definition. Monthly Microsc. Journ. VII., 1872, 

 pp. 59-68, 101-104. 



16. On positive and negative aberration. 



Monthly Microsc. Jouru. VII., 1872, pp. 136-137. 



17. On the various phenomena exhibited by 



the Podura test under ordinary and extraordinary 

 microscopic resolving powers. Monthly Microsc. 

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18. On a method of ascertaining magnify- 

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 Monthly Microsc. Journ. VIII., 1872, pp. 266- 

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19. On a method of estimating the optical 



and actual thickness of microscopic covering 

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2O. Note on immersion object-glasses for 



the microscope. Quarterly Jouru. Microsc. Sci. 

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21. On the present condition of English 



object-glasses as regards defining power. 

 Quarterly Journ. Microsc. Sci. XII., 1 872, pp. 

 260-268. 



22. On the differences between the nominal 



and solar focal length of English object-glasses. 

 Quarterly Journ. Microsc. Sci. XII., 1872, pp. 

 268-272. 



23. On a method of finding the refractive 

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 XII., 1872, pp. 273-275. 



24. On an aerial stage micrometer : an 



improved form of engraved " lens-micrometer " 

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 1873, pp. 2-5, 51-53. 



