celebrated Zeiss oil-immersion ob- of wire attached to the feet, are placed in this vessel. The jective. air in the hollow glass bulb will draw them up to the sur- the moving pen. The formula for the Zeiss lens was worked out by Prof. Messrs. Samuel Mart, of Sutton at-Hone, County of Kent, face of… … that by pressure on the lower bar the poke is spread Again, the front combination is made active, up to Fig. 1.-ELECTR0PH0RUS WITH ELDER PITH FIGURES. open. The free end of the lower bar, when it is 6° beyond the equator of the sphere, a surface ex- ceeding the hemisphere by about one-twentieth of…
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