OBSERVATIONS OX FILARI.E. /O 



part of the surface of the urinary tract by a lymph vesicle, caus- 

 ing the phenomenon of chyluria. 



(Filarice in the Blood of the Dog.) 



I have been favoured by Dr. Araujo, of Bahia, with an account 

 of the Filaria immitis, as found in Brazil. I never examined the 

 blood of dogs until April of this year, when I found the Filaria 

 described by Welch in the "Lancet" of 1873, p. 337. So far, 

 I have not enquired into the matter of the parent worm of this 

 Filaria, my attention being directed to ascertain by what means 

 the parasite may be carried from dog to dog. 



On May 17 I found that the louse, Trichodectes laius, swal- 

 lows the Filaria of the dog, I have seen the Filaria alive and 

 very active among the blood from the stomach of the louse ; in blood 

 of fleas so far I have not seen it. 



The dog Filaria is smaller than the human parasite, shorter by 

 one-fourth, and about half the thickness. It has no envelope. The 

 head is angular, that of the human subject is distinctly oval, so by 

 this peculiarity alone the worms can be distinguished. 



The dog worm is more active, and escapes quickly out of the 

 field of the microscope, whereas the human Filaria will remain in 

 the field or near by for many minutes, and in half-an-hour it will 

 not have travelled far when under a cover glass. Beck's two- 

 inch, with the higher eye-pieces, I find most suitable to search for 

 Filarice. 



Letter by Dr. da Silva Lima. 



The following abstract of a letter (to myself j, whilst referring to 

 the communication of Dr. Paterson, also notices other matters 

 having a more or less direct bearing on the subject under considera- 

 tion : — 



"' Bahia, le 17 Juillet, 1879. 

 ** Tres honore et savant confrere, 



" Je me fais un devoir de vous remercier du bienveillant accueil 

 que vous avez bien voulu faire a mon article sur la Filai ia Medi- 

 nensis, en le faisant paraitre in extenso dans le Veterinarian ; 

 honneur qu'il ne meritait pas, et encore moins celui d'etre tire a 

 part. Mon excellent ami, M. le Docteur Paterson me prie de vous 

 envoyer son dernier (troisieme) article sur la question de la gainede 



JoDRN. Q. M. C, IS... 43. G 



