PLATE 5 



EXPLANATION OF FIUUUES 



10 Giant cell from the Ijone marrow of a younji, but full grown, well fed 

 chicken, after one day's incubation; to represent the type which is generally 

 named giant cell and is not identical with Foot's 'Riesenzelle.' 



11 to 19 White bone marrow of a young, nearly fatless chicken in tissue 

 culture at 38°C. After one hour's incubation the tissue particle was extracted 

 and the emigrated cells were allowed to develop further. February 11 to Feb- 

 ruary 25, 1916. A detailed description of the changes of the eosinophil leuco- 

 cytes is given on page 82-84. 



20 to 27 The same bone marrow particle after having been freed from its 

 eosinophil leucocytes by the above described process was implanted for one 

 day again in a plasma medium and extracted again. The emigrated cells were 

 allowed to develop from February 12 to February 25, 1916. Figures 20 and 21 

 represent a cell type more related to fat cells, figures 22 to 24 a type more re- 

 lated to connective tissue cells, figures 25 to 27 show known cell types which have 

 not changed their character in the tissue culture. Note figure 24: a so-called 

 form of the cell culture type. All cells on plate 5 are conserved in Orth's fluid 

 and stained with Giemsa stain. 



116 



