WHITE BLOOD-CORPUSCLES. 



A. Mount under a cover -glass supported by a piece of 



hair or a bristle a drop of blood obtained by prick- 

 ing the finger near the root of the nail with a fine 

 needle. Surround the margin of the cover-glass 

 with vaseline. Make the preparation as quickly 

 as possible in order that it may not dry. 

 Disregard the colored corpuscles and look for the 

 less frequent white ones. Observe : 



I. General Characters. 



1. Form : irregularly rounded ; changes occur 

 as in amoeba, but more slowly. 



II. Structure. 



1. Granular protoplasm. 



2. Nucleus (rarely visible in the fresh state). 

 Sketch. 



III. Movements. 



Place the preparation on a loarm stage and heat 

 gradually to 38 degrees C. Record the result. 



B. Mount in the same way corpuscles of the codomic 



fluid of the earthworm. This may be obtained 

 by exposing the worm for a moment to the 

 vapor of chloroform, when the fluid will exude 

 through the dorsal pores j touch a cover-glass to 

 the fluid and instantly mount. 



Note the shape, and changes of form that may 

 occur. 



Sketch, 



