HEART-BODY, ETC., OP CERTAIN FOLYOHiETA. 275 



stained spot, sometimes surrounded by a ring (fig. 8), which 

 may represent the nucleus, embedded in a spherical granular 

 mass composed of globules of a colourless material, in the 

 centre of each of which is a minute refringent granule, un- 

 stained, but naturally of a yellow or pink colour (fig. 10). In 

 teased preparations it is well seen that each spherical space 

 containing such a mass is enclosed in a definite membrane 

 (figs. 6 and 7). Frequently from two to eight masses occupy 

 a single space, in which case they are smaller than single 

 masses, by the division of which they are probably formed 

 (fig. 9). The "nuclei'^ are frequently well marked at this 

 stage (fig. 11). About this stage also the bodies begin to show 

 a slight general stainability with Ehrlich's hsematein. The 

 limits of each mass, as well as of the spaces, are defined by a 

 membrane, which is often developed unequally in several 

 masses in the same space ^^fig. 10) ; the appearance of these 

 membranes is very striking, — indeed, they are most conspicuous 

 objects in a section of the heart-body (fig. 2). They are oval 

 in shape, and much creased and folded along the long axis ; 

 the surface is often scattered with granules (fig. 12), and some 

 of the folds or contents of the folds stain very intensely. 

 Meanwhile the granular mass itself round which the membrane 

 was formed has disappeared. Minute holes in the membrane, 

 revealed, as will be seen later, by the action of caustic potash, 

 may be the way of exit for this matter (fig. 13) ; at any rate, it 

 appears to be extruded into the surrounding space (fig. 14), 

 and eventually gets into the groundwork, where it undergoes a 

 transformation which gives rise to the rich granulation that 

 characterises the heart-body. The refringent globules, colour- 

 less or with a slight tinge of green, form a morula-like mass 

 (figs. 15 and 16), in whicli some of them are turning brown. 

 Eventually the whole mass becomes a deep gveenish-brown 

 colour, and forms a large composite granule (fig. 17). The 

 minute yellow points, which were mentioned above as occurring 

 in the centre of each globule, probably survive in the form of 

 a dark spot, to be seen in fresh teased tissue in the centre of 

 some of the larger granules (figs. 18 and 19). Besides brown. 



