Cerebellum in Cases of "Shock." 



79 



small an amount of chromatin as in type y. The cytoplasm shows 

 a very scant amount of tigroid substance which is distributed with 

 moderate regularity. The granules of tigroid substance are so 

 fine and so few that the cell appears very pale and with too much 

 lighting from the substage may even be missed in a careless ex- 

 amination. At times there is noted near the periphery a thread- 

 like formation of the tigroid substance. In this case the threads 

 run concentrically with the periphery of the perikaryon. 



Type e. — The perikaryon is 28 /x wide and 38 p long. The 

 nucleus has a mean diameter of 12 n. The nucleus is as in type 7. 

 The tigroid substance is of about the same density as in type 7 

 but the arrangement is peculiar in that the cell appears as if there 

 were an exoplasm and an endoplasm, both clearly defined, and 

 the tigroid substance limited to the latter. 



Type f . — The perikaryon is 14 n wide and 45 /j. long. The 

 nucleus has a mean diameter of 7 ll. The nucleus and cytoplasm 

 are similar to type j3. The cell is often extremely pyknomorphous, 

 even in thin sections. One often finds this type of cell bent almost 

 at right angles or irregularly twisted. 



Type 77. — The perikaryon is almost circular with a diameter 

 of 15 fx. The nucleus has a mean diameter of 8 fx. The nucleus 

 and cytoplasm appear as in type f . 



Type 6. — This type of cell is much broader than it is long. It 

 is a very infrequent finding and so far as its staining character- 

 istics are concerned it usually approaches type |3. 



If one follow the granulo-molecular junction through many 

 folia it becomes evident that there is no definite choice or arrange- 

 ment of these several types of cells. A succession of from four to 

 ten or twelve type 5 cells is a frequent occurrence. To either side 

 of this collection may be found cells of type @. The absence of 

 Purkinje cells over long extents of granulo-molecular junction 

 is of irregular but normal occurrence and is found as frequently 

 at the apex of a folium as in the deep recess of a sulcus. 



Classification of Experimental Work. 



Our animals were subjected to conditions which reduced the 

 blood-pressure markedly for a period of two hours. Moreover in 



