90 N. H. COWDRY. 



EXPLANATION OF PLATE I. 



All the figures have been drawn with Zeiss apochromatic 1.5 mm., compensating 

 ocular 8 and camera lucida. They have been reproduced without reduction so 

 that the magnification as they now appear on the plates is 2,600 diameters. 



FIG. i. Enteridium rozeanum fixed in Regaud's fluid and stained by the Benda 

 method. The mitochondria are stained a dark purplish-blue color against a pink 

 background. Plasmodium showing a large area of apparently homogeneous 

 protoplasm, a few spherical nuclei and some mitochondria, are seen to one side. 

 The ground substance shows a tendency to be more vacuolated and to stain fainter 

 in the vicinity of the nuclei. 



FIG. 2. Lycogala epidendrum fixed in Regaud's fluid and stained with iron 

 hematoxylin. The mitochondria are stained bluish-black against a gray back 

 ground. A portion of the plasmodium crawling upward toward the aethalium 

 on the meshwork of the hypothallus. 



FIG. 3. Enteridium rozeanum same fixation and stain as Fig. I. Likewise 

 a portion of the plasmodium greatly vacuolated. The nuclei are stained intensely 

 and the mitochondria are often grouped about them as well as about the vacuoles. 



FIG. 4. The same showing quite well differentiated fibrous structures which 

 often appear to be of the nature of septae separating the plasmodium into different 

 areas. 



FIG. 5. Another part of the same plasmodium with scattered nuclei and 

 mitochondria of various forms. The ground substance shows an indistinct 

 vacuolation. 



