122 



ELEMENTARY BIOLOGY. 



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i 



about J- the size of the red ones 

 under a high power. 



The red corpuscles, 

 a. Their form ; oval when seen e7i face ; al 



linear in profile but slightly swollen at the 

 centre. 



y8. Their size ; their length, breadth, and thicknes 

 measure. 



y. Their colour ; pale yellow, when seen indivi- 

 dually ', redder when seen in the aggregate. 



8. Their structure ; homogeneous for the most part, 

 but possessed of a central oval or rounded nucleus. 



€. Treat with water; they swell up and become 

 more spherical; their colouring matter {hcemo- 

 globin) is gradually dissolved out, leaving be- 

 hind a colourless protoplas7n. The nucleus is 

 rendered very evident, and ultimately all the 

 rest of the corpuscle disappears. 



C Treat with dilute acetic acid; results same as 

 with water, but produced more rapidly. 



y\. Treat with alcohol and borax-carmine su 

 cessively. The nucleus stains with great in- 

 tensity, the rest of the corpuscle remaining un- 

 affected. 



n 



c. The white corpuscles. 



Obtain a drop of fresh blood and examine as be- 

 fore under your highest power. 



Their form ; very irregular, the surface being 

 produced out into a number of blunted pro- 

 cesses ox pseudopodia. 



a. 



J 



