AMCEBOID PHENOMENA. 



21 



it by the brass clips. Heat is applied to the copper tongue by a small spirit- 

 lamp flame, and a greater or less amount is conducted to the warm stage 

 and the superjacent preparation according to the point to which the flame is 

 applied. To ascertain that the right temperature is got and maintained, put 

 two pieces of paraffin, one melting at 35 C. (95 F.) and another at 38 C. 

 (100 F.), on the slide, one 011 either side of the preparation. The tempera- 

 ture must be such that the first piece is melted and remains so whilst the 

 second remains solid. 1 



2, Mount a drop of newt's blood diluted with an equal amount of salt 

 solution, and examine it in the same manner upon the copper stage, at first 

 cold, afterwards warm ; the temperature must, however, be kept below 30 C. 

 Observe the effect of heat in accelerating the amoeboid movements of the pale 

 corpuscles. Sketch one at intervals of a minute (a) in the cold, (6) whilst 

 warmed. 



FIG. 19. WHITE COEPUSCLES OF FROG'S BLOOD MIGRATED FROM SHRUNKEN 

 CLOT WITHIN A CAPILLARY TUBE. (From Sanderson's Handbook for the 

 Physiological Laboratory.) 



3. Take some yeast which has been mixed with salt solution, and mix a 

 little of the yeast and salt solution with a fresh drop of newt's blood, slightly 

 oiling the edge of the cover-glass as before. Endeavour to observe the incep- 

 tion of torulse by the white corpuscles. Sketch one or two corpuscles con- 

 taining torulse. 



Milk-globules or particles of carbon or of vermilion may also be used for 

 this experiment, but the process of inception is most readily observed with 

 the yeast particles. 



1 For exact work, an apparatus somewhat more complex than the above is required. 

 For description of such see A Course of Practical Histology. 



