I. UICROSCOPES. 779 



3626. Dr. Bur don Sanderson's hot or cold Stage, for 



use with microscope, and with arrangement for gas. 



T. Hawksley. 



3626a. Boiler with incubating cells. T. Hawksley. 



3627. Freezing Machine for making microscopic sections, 

 by Professor Rutherford. T. Hawksley. 



3628. Saccharometer, as accessory to the large microscope, 

 from the same contributor. JR. Wasserlein, Berlin. 



The saccharometer is to be regarded as an accessory to the stage of the 

 microscope. By this combination of two instruments (as the saccharometer 

 can be fitted to smaller stages) cheapness is attained. The chief aim of the 

 maker is to .furnish a useful instrument, which at the same time shall be 

 specially suited to the wants of the medical chemist in estimating grape sugar 

 (as in diabetes). For this purpose the scale of the instrument is graduated so 

 as to indicate in whole numbers and tenths the per-centage of grape sugar. 

 For other substances a calculation is necessary. 



3629. Woolmeasurer, fitting into the Student's Micro- 

 scope. R. Wasserlein, Berlin. 



This woolmeasurer, constructed by the exhibitor, is made at the express 

 wish of Mr. Bohrri, woolfactor at Leipzig. It affords the investigator the 

 possibility of a complete command over stuffs composed of vegetable or animal 

 fibres, as wool, silk, and all vegetable fabrics, so that they can be stretched and 

 extended under the microscope ; also in case the fibre is twisted, as in wool, it 

 may be evenly stretched and turned round itself, so that its average diameter 

 may be estimated. The apparatus allows the object which is thus stretched 

 to be placed on a glass slide, so that it can be treated with acids, &c., and 

 covered with a cover glass. All this can be done without preventing the 

 manipulation described above. Threads up to a length of l inch can be moved 

 successively across the field of the microscope. 



3630. Small Microtome, with an arrangement for the vertical 

 elevation of the objects. F. Suss, Marburg. 



3631. Larger Microtome, for the section of the spinal cord, 

 with vertical elevation and divided circle. F. Suss, Marburg. 



3632. Quadrant Microtome, for making microscopical sec- 

 tions at any given angle, with an arrangement for measuring the 

 angle, and- scale for showing the relative thickness of the section. 



F. Suss, Marburg. 



3633. Large Microtome, for cutting sections of the brain. 



F. Suss, Marburg. 



These microtomes are suited for embedding preparations. Samples of 

 embedding preparations (soap mixtures), with instructions as to the use of the 

 instruments, as well as the composition of the soap mixtures, are placed with 

 the microtomes. 



3634. Large Schiefferdecker's Microtome, with plate, 

 two knives in case, glass bell jar, and tin mould for fixing pre- 

 parations in an embedding mass. F. Majer t Strassburg. 



