132 p. MANSON ON MICRO-FILARI^, WITH 



foreign countries, and although acknowledgments on the part of 

 investigators are now generally held to be unnecessary, several 

 foreign gentlemen interested in Manson's researches have expressed 

 their sense of gratification at the progress helminthology is making 

 at the hands of our countryman in China. 



T. S. COBBOLD. 



"Amoy, 19th April, 1880. 

 ''T. Spencer Cobbold, Esq., F.R.S. 



" Dear Sir, — I read in the Lancet of 6th March, with much in- 

 terest, the short account of the meeting of the Quekett Club, on the 

 previous week, and the discussion on Filaria. My only regret is 

 that I did not supply you with fuller details of my observations and 

 more decided proof of my assertion about the periodicity of the 

 filaria's appearance in the blood. I am very grateful to you for the 

 trouble you have taken in bringing these forward, and cannot but 

 feel that, unless for your kind assistance, my work would lie en- 

 tombed in the * Customs Gazette,' and be of little use to any one. 

 The paper I hope to send herewith, though prepared seven or eight 

 months ago, is only just printed. It contains a short account of 

 my observations on periodicity, and abundant proof of my position. 

 I believe it will have some interest for you, especially that part 

 which describes the formation of the sheath of the embryo hfema- 

 tozoon of Corvus torquatus, and the discovery in the lymphatics of 

 the ova of Filaria Bancrofti. 



" Believing they are new to you, I send, under the care of Dr. 

 Faulkner, surgeon of the SS. ' Agamemnon,' specimens of the 

 parents of the haematozoa of Cormis torquatus, and also a number 

 of hearts of the Chinese magpie. Pica media, containing very in- 

 geniously located parent worms of a species of filaria common to 

 that bird and to Gracupica nigricollis. I also enclose in this letter 

 some rough sketches illustrating the embryos, etc., and will, in the 

 sequel, give you a brief account of what I have made out about 

 these interesting parasites. 



'' Hcematozoa of Pica media. — I have examined many, I suppose 

 thirty or forty, magpies, and have never failed to find ha^matozoa in 

 any of them. But though I searched diligently in all the viscera 

 and large vessels, I was a long time in discovering the habitat of 

 the parents. At last I came across a female larva in a small clot 



