ABSTRACT
The chief practical advantages of the microscope of Chevalier are, – extent of field of vision, distinctness of outline, even with the highest powers, high magnifying power, a sufficient distance of the object-lens from the object, which amounts to a line even with the highest powers, simplicity of apparatus, and, consequently, a very moderate price. With as extensive a field of vision, it has still greater, perhaps too great, light, it magnifies nearly double the diameter with great distinctness of outline; its use is more convenient under high powers, from the employment of several eye-glasses, instead of the elongation of the tube required by the former. Schiek’s microscope unites the advantages of both of the others. Its field of vision is extensive, extremely sharp and clear illumination, even to the highest powers, appearing to much clearer than either of the others. From the simplicity of its arrangements, the price is very moderate, and therefore particularly adapted for the working naturalist.
