t of late they have been altogether distanced in optical science by English and through the streets of a city with perfect safety to the in- American opticians. The principal feature of advance dur- ‘ing the past year was the celebrated Zeiss oil-immersion ob- jective. the moving pen. Messrs.… … that by pressure on the lower bar the poke is spread Again, the front combination is made active, up to Fig. 1—ELECTROPHORUS 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- drawn down, throws the free end of the upper bar…
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