PRACTICAL HISTOLOGY. 



BLOOD. 



Take a small drop of newt's blood, cover and ex- 

 amine : notice the difference in shape and number 

 between the coloured and white corpuscles. Prick 

 the finger and examine human blood in the same way. 



AMOEBOID MOVEMENT. 



A warm stage is required to show the amaeboid 

 movement of the white blood corpuscles. 



With a camel's hair pencil apply a little oil round 

 the edge of a cover glass, place a small drop of per- 

 fectly fresh newt's blood in the centre of the glass, 

 and cover with another ; lay the preparation on the 

 warm stage over the central hole, and apply the spirit 

 lamp to the wire. The thermometer should rise to 

 30 C. 



Select one of the large colourless corpuscles, and 

 sketch the different movements shown by it at distinct 

 intervals. Make a similar preparation of human blood, 

 and examine in the same manner. The cover glass 

 must be warmed for human blood, and the top cover 

 glass should be touched on the spot of blood coming 

 from the pricked finger. The coloured blood corpuscles 

 will form rouleaux if properly prepared. 



A preparation of fresh newt's blood should be ex- 

 amined with a high power on the warm stage to see the 



