216 Messrs. Simonds and Cobbold on the Production [May 4, 



instead of destroying the animal (as we had purposed in the event of its 

 becoming much worse), we resolved to satisfy ourselves, by other means, as 

 to whether the above symptoms were really due to parasite-invasion. 

 Accordingly a small portion of the right sterno-maxillaris muscle was 

 removed by operation, and this fragment of the flesh, although weighing 

 only 22 grains, revealed the presence of three imperfectly developed 

 cysticercus-vesicles. Each was about the size of a pin's head, but they 

 displayed no trace of calcareous corpuscles, or of cephalic formation in 

 their interior. On the assumption (afterwards, however, found to be 

 erroneous) that all the muscles of the body might be similarly affected, 

 and to the same extent, it was at the time calculated that the animal 

 "entertained" some 30,000 of these artificially introduced "guests." 



Feb. 12th. A further improvement has taken place, but the animal is 

 still dispirited, the pulse and breathing continuing abnormally rapid. The 

 eves are less staring. 



Feb. 13th. Improvement continues ; breathing less rapid ; the tremors 

 have disappeared. 



Feb. 15th. Pulse diminishing ; breathing nearly normal ; appetite good. 

 Feb. 22nd. Convalescence perfectly re-established. 

 Throughout the remainder of the month of February, and during the 

 whole of March, the calf continued to maintain complete vigour, and, 

 indeed, gained flesh so rapidly that at the beginning of April it might readily 

 have been sold to a farmer, to a butcher, or to a cattle-dealer, as a thoroughly 

 sound and thriving young beast. The time having, however, arrived for 

 determining the result of the experiment, the calf was slaughtered on the 

 3rd of April, by division of the right carotid artery. The operation was 

 performed by Mr. Pritchard, who also during the subsequent post-mortem 

 examination rendered us essential service. As before, so after its death, 

 all present remarked the particularly healthy aspect of the animal, there 

 being no external indications by which the most practised professional eye 

 could have discovered the existence of internal disease. But for our pre- 

 vious trial we should ourselves have been doubtful of finding any entozoa 

 within the flesh. 



Immediately after the first incision along the median line of the thorax, 

 a solitary cysticercus came into view, many others successively displaying 

 themselves as the integument was being raised and dissected from off the 

 left side of the carcass. No person in this country having hitherto wit- 

 nessed such a demonstration as now followed, we may perhaps be per- 

 mitted to express the feeling of astonishment which all shared on thus 

 beholding hundreds of larval cestode parasites in the flesh of an animal 

 not usually considered capable of harbouring "measles" after the fashion 

 of swine. 



Examined individually, the larvse were enclosed in oval sacs, whose trans- 

 parency permitted us to see, at or near the centre of each vesicle, inter- 

 nally, a minute white spot representing the so-called receptaculum capitis. 



