70 PARASITES OF MAN 



" 10th. Two individuals of T&nia perfoliata of the horse died, 

 the first at 45 C., the second at 50 C. 



" llth. The embryos of the Filaria microstoma of the horse 

 began to stand still at 4647, and all died at 48 C. 



" 12th. The embryos of the Filaria megastoma of the horse's 

 stomach died at 47 C. 



" 13th. The Trichina spiralis, both free and in a cyst, in 

 several experiments always died at 48 C. 



" 14th. The embryos of the Strongylus filaria of the sheep 

 stood still at 50 C. 



"15th. Probstmayer's viviparous oxyurids, the infusoria of 

 the colon and caecum of the solipeds, and the psorosperms of 

 the liver of the rabbit did not stir at all. 



"Each experiment lasted about ten minutes, and the tem- 

 perature rose from 8 10 C. to 45 46 C. in six to eight 

 minutes ; and from 46 to 50 in one minute. These experi- 

 ments have a great value, both scientific and practical, as they 

 show, on one side, which is the lowest intensity of heat suffi- 

 cient to kill always the Cysticercus, the Trichina, and other 

 parasites, reducing thus by far the tenacity of life generally 

 attributed to a large number of Helminths and corresponding 

 larval forms. They assure us, moreover, of the harmlessness of 

 the flesh infected by the above-mentioned parasites, when it is 

 cooked in such a manner as to reach the temperature of 50 C. 

 over all points of the pieces, even though it be kept at such a 

 degree of heat not longer than five minutes. 



" In a piece of leg of pork the Cysticerci were found alive in 

 all places not yet putrefied twenty-nine days after the animal 

 had been slaughtered. On the other hand, in the dry muscles 

 of a calf the Cysticerci of the T&nia mediocanellata were all 

 found dead fourteen days after the slaughtering of the animal. 

 I have ascertained that putrefaction of the flesh is fatal for the 

 two larval forms of these different kinds of helminths." 



In a subsequent communication received from Professor 

 Perroncito towards the close of the year 1877 he writes : 



" At the last meeting, held on April 23rd, I made a state- 

 ment to the Medical and Surgical Society of Turin, of the 

 results of other experiments tried by heating at M. Schulze's 

 table and by the imbibitions with the neutral tincture of car- 

 mine, through which I came to the conclusion that the Cysticerci 

 of the Ttenia mediocanellata die sometimes at 44 C., now and 

 then at 45 C., and always at 46 C. I therefore concluded 



