108 RHODA ERDMANN 



Walton, A. J. 1911 Variation in the growth of adult mammalian tissue in 

 autogenous and homogenous plasma. Proc. R. S. L., B., vol. 87, 

 p. 452-61. 



1914 The effect of various tissue extracts upon the growth of adult 

 mammalia cells in vitro. Journ. of Exper. Med., vol. 20. p. 554-573. 



EXPLANATION OF PLATES 



The drawings were made from total preparations, with Abbe camera lucida, 

 Zeiss homogeneous immersion 2 mm. and compensating ocular 12, with drawing 

 board level with stage of microscope. Magnification about 1500 diameters. 



PLATE 1 



EXPLANATION OF FIGURES 



The bone marrow used for the preparations shown in figures 1 to 6 was taken 

 from a well fed, full grown chicken containing a large amount of fat. It was 

 incubated at a temperature of 38°C. in the chicken plasma medium. 



1 The first cells emigrating from the particle into the plasma. Bone marrow 

 one hour in plasma, January 3, 1916, 10 a.m. to 11 a.m. Two mononuclear 

 eosinophil leucocytes, one lymphocyte, and one normoblast are visible. 



2 Cells which have left the implanted bone marrow particle after twenty- 

 four hours and emigrated into the plasma. January 3 to January 4, 1916. Mon- 

 onuclear and polynuclear eosinophil leucocytes with rod-shaped granules and 

 large granulocytes with rounded, highly refractile granules are visible. Two 

 fat cells at the right and left side of the preparation have divided up their big 

 fat globule into small fat droplets (compare plate 6). In the middle a large non- 

 granular lymphocyte is to be seen. 



3 Cells which have left the implanted bone marrow particle and have ad- 

 vanced to the border of the plasma clot after forty-eight hours' incubation. 

 January 3 to January 6, 1916. One large 'Riesenzelle' and a small granulocyte 

 with highly refractile granules are visible together with one small lymphocyte 

 with vesicular nucleus. Red blood corpuscles with or without nuclei are present. 

 One red blood corpuscle extrudes its nucleus. 



6 Cells which have stayed two hundred and sixteen hours in the plasma 

 medium December 25, 1915 to January 3, 1916. Cell culture types. 



