STUDY OF THE BLOOD-CORPUSCLES OF AMPHIBIA 15 



of reagents, especially acetic acid. The action of reagents upon the 

 red corpuscle of amphibia is otherwise similar to that produced upon 

 the mammalian corpuscle, water and acetic acid causing it to swell 

 into a globular form and then to become decolorised ; solution of salt 

 causing a shrinking of the corpuscle, and so on. Boracic acid acts 

 like tannic acid in causing the haemoglobin to be withdrawn from the 

 stroma ; but it becomes partially or wholly collected around the 

 nucleus, which may then be extruded from the corpuscle. 



FIG. 14. COLOURED 

 CORPUSCLK OF SA- 

 LAMANDER, SHOW- 

 ING INTRANUCLEAR 

 NETWORK. (Flam- 

 ming.) 



FIG. 13. FROG'S BLOOD. (Ranvier.) 



a, red corpuscle seen on the flat ; v, vacuoles in a cor- 

 puscle ; b, c, red corpuscles in profile ; n, pale cor- 

 puscle at rest ; m, pale corpuscle, exhibiting amoeboid 

 movements ; p, coloured fusiform corpuscle. 



The colourless corpuscles (fig. IB, k, m, n}, although larger, are 

 very similar to those of mammals. Like them, they are of two kinds 

 either wholly pale or enclosing a number of dark granules. They 

 vary much in size and in the activity of their amoeboid movements. 

 They may have one or several nuclei. Keagents have the same effect 

 upon them as on those of mammals. 



