| No. 77. | Thoma's Haemacytometer consists of an object glass
with carefully constructed cell, a ground absolutely
plane coverglass and two pipettes for mixing the blood
and saline solution used in the examinations. One of
these pipettes, for estimating the number of red corpuscles
is so graduated as to permit dilution of the blood
100 or 200 times as required; the other, for counting
the white corpuscles (leucocytes), is graduated for
dilution of the blood 10 or 20 times. The volume contents of the pipettes are most carefully determined and the depth of the cell is established by accurate micrometric measurement, thus permitting very exact observations by means of this instrument. (A full description with each instrument) | $12.— |
| No. 78. | Mixing-Pipette for white corpuscles | $3.60 |
| No. 79. | Mixing-Pipette for red corpuscles | $3.60 |
| No. 80. | Thoma counting chamber, with coverglass | $5.75 |
| No. 81. | Türck counting chamber with coverglass | $7.25 |
Counting chamber
after Thoma after Türck.
Ehrlich's Eye-piece.
| No. 82. | Ehrlich's Eye-piece is provided with a diaphragm having
a square opening, the size of which is regulated by a
small lever. This eye-piece is designed to facilitate the estimation of the relative numbers of red and white blood corpuscles in dry preparations. Full directions accompany each instrument | $12.— |
| No. 82a. | Apparatus for the clinical determination of the alcalinity
of the blood, after Prof. C. S. Engel. The following parts compose the apparatus: 1) a capillary pipette so graduated as to permit the dilution of 0,05 cc. blood from the finger, up to 5 cc. with distilled water. 2) a beaker, for the reception of the diluted blood. 3) a burette mounted on stand, capacity 10 cc. Full directions accompany each outfit. Price in box | $8.— |
Micrometers.
