BAIRD &TATLOCK (LOM)ON) LTD. 



If this hue of the sample solution is already attained, when you have filled in water up to the line 50. the 

 blood only has 50 % normal htemoglobine. In this way always the line to win. h tin- mixture hai to be 

 iiluted with water gives the percentage of the tested blood in per cents, of the standard. I lie . ..iM|).m,.iii i 

 I .in is made in rejected light by putting both tubes in the holes of the l.K. hl<xk and plating a white 

 IIKT against the daylight. In this way you avoid best the deceptions which are caused l>v the \urums n 

 i,.us cif the picarminic glycerin and the blood solution according to the wuy the liht i-. lallini; mi thrin I ! 



;hc standard solution has been specially tested for this paper shade. 



It t lie test is carefully made, the reiult is accurate up to about 5 %. The glass tube with white point is (or 

 lit examinations, that with black point for artificial light examinations. 



A807 



.\807 T Haemometer, after Sahli . . 



DIRECTIONS FOR USE ACCORDING TO SAHLI. 



After the graduated glass has been rilled up to the loth division by means of the larger pipette or a droppm-- 

 bottle with the diluted hydrochloric acid (so-called i-io standard hydrochloric acid) wlmh i- used as reagent. 

 take from the patient by means of a lancet or Frank's fleam a drop of blood in the usual manner, of which 

 20 cram, is drawn up into the capillary pipette and blown into the graduated glass. By repeatedly sucking 

 the liquid back and blowing it out again the capillary must be completely liberated from the blood taken up 

 and the blood must be intimately mixed with the hydrochloric acid. 



After waiting exactly one minute until the mixture is coloured dark brown and has 

 clear add water slowly with constant shaking to the mixture by means of the larger pipette or a droppin 

 bottle until the mixture shows exactly the same colouration as the standard solution when placed besu 

 latter in the ebonite stand and observed in incidental light. The percentage of haemoglobin in the b 

 then be read directly at the division up to which water had to be filled to obtain like colouration. In ordi 

 that the scale of the graduated tube shall not disturb and that no preconceived opinion as to the percentage 

 of hemoglobin to be expected may come into play, it is preferable to turn the Rraduated glass so that the scale 

 disappears behind the edge of the ebonite frame, and from the first to cover the top part of the glass witr 

 paper during the determination. 



The examination can be made both by artificial light and daylight, and for specialty exact determinations 

 preferably in a dark room with artificial' illumination employing a laryngeal lamp or a dark la 



808' Hayem-Sahli Hsemacytometer, for bedside investigations (as described in Prot. Sahli's 

 " Lehrbuch der klinischen Untersuchungsmethoden," 5th Edition, 1909, pp. 854 to i 

 861, 862), in case 



The apparatus consists of : 



\ Eyepiece III with sliding eye lens and screw-in Hayem counter, including tables 



B Object Slide and Chamber 0.2 mm. deep, without ruling, but with reference squa 



of 0.2 mm. side ruled on the floor of the chambsr and surrounded by conce 



orientation circles 



C Object Slide with Chamber 0.1 mm. deep, with reference square of 0.2 mm. 

 side surrounded by concentric orientation circles, and, in addition, a n 

 scale, viz., i mm. divided into 100 parts 



i 



17 6 



2 15 



14 



040 



090 



