108 



ORIGIN OF COLORED BLOOD- CORPUSCLES. 



Reasoning by analogy, it seems that we are forced to conclude that 

 adenoid tissue is myxomatous, and therefore a remnant of f ratal tissue. We 

 know that the myxomatous tissue is abundant in the embryo, and relatively 

 scarce in the fully developed foetus. In the adult, the vitreous body was 

 considered the only remnant of embryonal myxomatous tissue. To this, 

 however, we should add the adenoid, and thus answer our first question. 



To get a better idea of this tissue, let us turn to its most minute anatomy, 

 and for the present we will confine our attention to its frame-work. As I 



FIG. 31. LYMPH-GANGLION OF CAT. 



B, myxomatous reticulum, exhibiting in its interior a delicate reticulum of living matter ; 

 G, granules of living matter arising from the growth of the intersections of the contained 

 reticulum ; V, granules grown into vacuoled corpuscles and intermediate stages of develop- 

 ment; L, full grown nucleated lymph-corpuscles; M, mesh of the myxomatous net-work, 

 tilled with lymph-corpuscles of all stages of development. Magnified 1200 diameters. 



have already said, in the frame-work, which looks perfectly homogeneous 

 under a 500, with a 1200 (immersion) we can readily recognize a delicate 

 reticulum piercing nearly all its fibers and plates. In some places, even 

 without the use of a staining re-agent, this net-work is just as plain as in the 



