INTRODUCTION. 



lix 



facts which have been brought to light since they were 

 made. 



Two points bear directly upon them : i. Repiachoff's 

 very curious observation, that the " brown body " is 

 actually taken into the substance of the young bud, 

 supplemented by Joliet's, that it afterwards passes entire 

 into the intestine and is ejected through the anus, or is 

 dissolved in the stomach and the remains disposed of in 

 the same way*; and ii. Joliet's interpretation of the funi- 

 cular tissue (which, it must be remembered, more or less 

 involves the " brown body "), and its relation to the de- 

 velopment of the polypide (see page 1). 



To take the latter first. Joliet holds that the buds 



Fig. xxvi. 



Polypide developed on the surface of a Brown Body. 

 B. Brown body. pol. 



which Smitt and myself supposed to be formed out of the 

 " brown body " are really developed out of the funicular 

 plexus which overlies it, and which escaped our notice. 



<>,>. ;/. pp. I'l-li-i. 



