PART III. J Comparative Size of Trichina and Embryo Dracunculvs. 5 1 9 



structural anatomy of the parts. The cephalic end of the Trichina is almost pointed, 

 and its caudal termination blunt ; whereas, although the anterior extremity of the 

 two Filarise agrees in the matter of being somewhat rounded, and the posterior end in 

 both comes to a very fine point, nevertheless, the relative proportion between the 

 tail of the one and that of the other is sufficiently great to present a marked 

 difference — the tail of the Dracunculus being nearly ^rd, whereas that of the 

 Haematozoon is not, at the utmost, more than |th of the entire length. Of course 

 this is exclusive of the hyaline tube within which the latter is enclosed. Possibly 

 when live young Dracunculi shall have been as carefully examined and described as 

 the lifeless specimens have been by Mr. Busk and Dr. Bastian, the similarity between 

 the Filarise will become more evident.* 



The comparisons just instituted between the three helminths referred to will, 

 perhaps, be more clearly understood by throwing these details into a tabulated 

 form : t — 



The part which the Haematozoon appears to take in the production of disease 

 will become still more evident when the condition of the kidneys and supra-renal 

 capsules, referred to in a previous paragraph (page 511) as having been obtained from 

 a patient who died of Chyluria, has been described. 



To the naked eye none of these organs presented any marked deviation from 

 the normal standard, except that the kidneys were more than usually lobulated, and, 

 that on section several of the pyramids, especially near their apices, presented a 

 smooth, tallowy appearance, suggestive of amyloid disease. No approach to the 

 characteristic iodine reaction could, however, be obtained ; but when longitudinal 



* Since this paragraph was in type, I have, however, had ample opportunity of satisfying myself on 

 this matter by the examination of numerous young Dracunculi in all stages of development obtained from 

 a patient suffering from Guinea-worm, admitted into the General Hospital under the care of Dr. Coull 

 Mackenzie; but I find that there is even less resemblance between the Filariae during life than was 

 suggested by lifeless specimens. 



t The measurements here introduced of the young Trichinse and Dracunculi do not materially differ 

 from those generally given. For the sake of uniformity, however, it was considered advisable to measure 

 all three with the same micrometer-scale. 



