LESSON XXL 

 THE COLOUR OF BLOOD. RESPIRATION. 



1. POUR a little defibrinated blood 1 into several 

 test-tubes (a) (d). 



a. Keep for comparison with the rest. 



b. Add an equal volume of water and warm to 

 about 50 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 (b) (c) (d) will be laky i.e. com- 

 paratively transparent owing to the haemoglobin 

 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. 



1 This may be obtained from the butcher's. 



