LESSON XXI. 



THE COLOUR OF BLOOD. RESPIRATION. 



1. Pour a little defibrinated blood' into several 

 test-tubes (a) — (d). 



a. Keep for comparison with the rest. 



h. Add an equal volume of water and warm to 

 about oO" C. 



c. Add a few drops of ether or chloroform and 

 shake. 



d. Add a little bile or solution of bile salts and 

 shake. 



The blood in (6) (c) {d) will be laky i.e. com- 

 paratively transparent owing to the hsemoglobin 

 of the corpuscles having been dissolved in the 

 fluid; compare the colour with that of (a), 

 compare also the transparency of (a) (c) by 

 placing a drop of each on a glass slide and 

 attempting to read type through it. 



' Tliia may be obtained from the butcher's. 



