Mechanical stage No. 98 can be fitted to this stand; price =28.--= [Illustration: Stand Ib.] =Stand Ib.= 5. =Large Microscope=, which differs from Ia only in the stage. The stage is fixed and square. The stand is inclinable and has a hinged joint and clamping lever. Draw-tube with millimetre scale. Coarse adjustment by rack and pinion, fine adjustment by micrometer screw with graduated head. Illuminating Apparatus, same as Ia (p. 22, b). Triple nose-piece. Objectives 3, 6, Oil-Immersion 1/12, N. A. 1,30. Eye-pieces I, III, IV. Magnifications 60—1000 =142.--= 6. =The same= with simplified Illuminating Apparatus (p. 22, c). Triple nose-piece. Objectives 3, 6, Oil-Immersion 1/10, N. A. 1,30. Eye-pieces I, III, IV. Magnifications 60—730 =120.--= 7. =The same= without Illuminating Apparatus, with Cylinder-diaphragm. Double nose-piece. Objectives 3, 7. Eye-pieces I, III. Magnifications 60—450 =74.--= 8. =The same= without Illuminating Apparatus and without nose-piece. Objectives 3, 7. Eye-pieces I, III. Magnifications 60—450 =68.--= =Stand= without objectives and eye-pieces, without illuminating apparatus and without nose-piece =46.--= =Stand= without objectives and eye-pieces, with illuminating apparatus, without nose-piece =70.--= =The same= with illuminating apparatus, with swing-out condenser and cylinder iris-diaphragm (p. 22 a) =76.--= [Illustration: Stand II.] =Stand II.= 9a. =Medium Size Microscope=, inclinable, with revolving centering vulcanite stage, coarse adjustment by rack and pinion, fine adjustment by micrometer-screw. Draw-tube with millimetre scale. Illuminating apparatus and iris- diaphragm with lateral screw for raising and lowering. A ring under the iris diaphragm serves to hold a ground glass or colored disc. The illuminating apparatus and cylinder diaphragm are easily interchangeable. Triple nose-piece. Objectives 3, 6, Oil-Immersion 1/12, N. A. 1,30. Eye-pieces I, III, IV. Magnifications 60—1000 =126.--= 9b. =The same= with Illuminating Apparatus. Triple nose-piece. Objectives 3, 6, Oil-Immersion 1/10, N. A. 1,30. Eye-pieces II, IV. Magnifications 70—730 =114.--= 9c. =The same= without Illuminating Apparatus. Triple nose-piece. Objectives 3, 6, 8. Eye-pieces I, III. Magnifications 60—550 =90.--=