BAIRD &.TATLOCK (LONDON) LTD. 



D. Two Pipettes for the Dihient, of 250 500 cub. mm. capacity, one marked " red," 



the other " white " .. .. .. .. .. ..each6/- 



E. Pipette for aspirating the blood, of 1 5 cub. mm. capacity, for red corpuscles, 



marked " red " . . . . . . . . . . . . each 



F. Pipette for aspirating the blood, of 5 25 cub. mm. capacity, for white corpuscles, 



marked " white " . . . . . . . . . . . . each 



G. Two Mixing Cells with stoppers, one marked " red," the other " white." These 



cells are so adapted to take to patient's bed for counting appropriately diluted blood 

 samples .. .. .. .. .. .. .. each, l/- 



H. Two Thick and Two Thin Plane-parallel Cover-Glasses . . each, 6d. 



I. Stirring Spatulum . . . . . . . . . . . . each 





 



ADDITIONAL APPARATUS : 



J. Object Slide with Chamber 0.02 mm. deep for very high magnifications. The 

 chamber has ruled upon its floor a reference square surrounded by concentric orienta- 

 tion circles and a micrometer scale (i millimetre divided into a hundred parts) each 9 

 K. Automatic Limit Stop for attachment to the microscope tube . . each 3 



L. Mechanical Stage with self checking travel in both directions, for systematically 



searching through the blood preparation, including case . . . . each 315 



809 



809' Hall's Rotary Hamoglobinometer, suggested by Arthur J. Hall, M.D., with supply 

 of Filter paper and two needles in case . . . . . . . . . . each 



Extra books, per doz. 



DIRECTIONS. 



1. Tear a slip of absorbent paper from one of the books, and holding it between the thumb and finger 

 of the left hand, draw it out with the right, so as to give it a slightly convex surface. 



2. Prick the finger or ear in usual manner. 



3. Soak up a drop of blood with one end of the slip, as in the careful removal of a blot of ink. 



4. Remove any excess of blood from surface of slip. 



3. Insert the slip (convex surface uppermost) down the slot D, D 1 so that the part infiltrated with blood 

 completely fills the circular opening C 1 ; bend down any part of the slip which projects beyond the edge at 

 D or D 1 . 



6. Rotate the edge of the revolving disc A 1 until the standard colour at the circular opening C most nearly 

 matches that of the blood stain at C t . 



7. Read off the corresponding percentage at the opening on the back of instrument. 



N.B. Good daylight is essential. The eye may be rested from time to time by turning the instrument 

 and looking at the green colour at the back. 



10 

 1 



CROSS STREET HATTCHSr GARDETST, E-C 



170 



