98 PARASITES OF MAN 



Mutton," contained in the fourth chapter of the Supplement to my 

 introductory treatise on Entozoa, where a figure of the parasite 

 is given, 1869, p. 27 ; to Dr Maddox's paper " On an Entozoon 

 with Ova, found encysted in the Muscles of a Sheep," recorded 

 in ' Nature/ May 15th, 1873, p. 59; to the 'Monthly Micro- 

 scopical Journal/ June, 1873, p. 245 ; to my further com- 

 munications in the f Lond. Med. Record/ Aug. 6th, 1873 ; to my 

 ' Manual/ 1874, pp. 74 and 105, Ital. edit. ' Nota Dell' Autore/ 

 p. 133 ; and especially to the article headed " The Mutton 

 Tapeworm," contained in the 3rd edit, of my little volume on 

 ' Tapeworms,' p. 12, et seq., 1875. 



In regard to the measle itself, I spoke of it as smaller than 

 the common pork measle. The head is ^" in breadth, and is 

 armed with a double crown of hooks, twenty-six in all, the larger 

 hooks each measuring y^" in length. The suckers are four in 

 number, each having a breadth of T ". The neck and head are 

 abundantly supplied with calcareous corpuscles, being at the 

 same time marked by transverse rugas. The data on which I 

 founded my brief description of the scolex were chiefly based on 

 the examination of a specimen which had been procured by Prof. 

 Heisch from the interior of a mutton chop. Subsequently much 

 fuller details of the structure of the scolex were supplied by the 

 illustrated memoir of Dr Maddox (above quoted). This excellent 

 microscopist, however, announced the presence of immature ova 

 within the Cysticerci themselves. As the notion of the exist- 

 ence of eggs in larval cestodes was altogether at variance with 

 what we know of the phenomena of tapeworm life, I suggested 

 that the author might have mistaken the egg-shaped calcareous 

 corpuscles (which I found so abundant in my own specimens) 

 for the ova. In the interests of truth I felt bound to charac- 

 terise certain of the conclusions arrived at by Dr Maddox as 

 simply incredible, but I regarded his memoir as forming " an 

 important contribution to our knowledge of the structure of the 

 mutton measle." I had no idea that in pointing to errors of 

 interpretation I should offend the excellent author. However, 

 a long letter appeared in the f London Medical Record/ in which 

 Dr Maddox showed that he was much vexed that I should 

 have " impugned" the " accuracy of his conclusions." He 

 defended his position with the support of no less an authority 

 than Dr Macdonald, F.R.S., the distinguished Assistant Pro- 

 fessor of Naval Hygiene at the Victoria Hospital, Netley. Dr 

 Maddox says : " We were quite alive to the anomalous posi- 



