12 ORGANISED FLUJDS. 



stage of cell development to be universal ; for in examining 

 the contents of the gland in early life, one finds no trace 

 whatever of complete cells. The dotted corpuscles are un- 

 doubtedly quite similar to those which we have recognised as 

 becoming the nuclei of cells in the thyroid body, and in 

 other organs ; there is abundant room for conjecturing them 

 to be of a correspondent function to be, in fact, true 

 cytoblasts; but the arguments for this point cannot be 

 considered quite conclusive, without some additional evi- 

 dence." 



" The completion of a cell, from the isolation of so much of 

 the secreted product as is collected round each cytoblast, is a 

 very frequent secondary process. In the true glands it is 

 very frequent, in those without ducts exceptional" (p. 84.) 



With one other remark on the corpuscles of the thymus, 

 we will conclude this short chapter : mixed up with those 

 corpuscles are frequently to be noticed many nucleated glo- 

 bules, in every way similar to the white corpuscles of the 

 blood, but very distinct from the true cell corpuscles of the 

 gland ; the nucleus of these white globules is of nearly the 

 same size as the dotted corpuscles themselves. Is there any 

 relation between this coincidence in size ? 



We now pass to the consideration of the most important 

 fluid in the animal economy, viz. the blood. * 



* Plate VIII. will contain figures illustrative of the chyle, 



