1886.] NATURAL SCIENCES OF PHILADELPHIA. 255 



cooked, measly pork, which had been eaten for a week from 

 January 6, 1886. The family consisted of a man and wife and 

 two daughters, aged respectively five and thirteen years. The 

 older daughter and the mother, aged 37 years, have died ; the 

 other members of the family, although affected, are recovering. 

 In the mother, who died March 8, the deltoid muscle showed, 

 under the microscope, three to nine ; the rectus femoris, two to 

 six, and the diaphragm, one to three trichinae, in a field view 

 about one-fifth of an inch in diameter. In the daughter, who 

 died February 19, trichina? were found imbedded in the deltoid 

 muscle, in some portions as many as forty-two being counted on 

 the field of view under the microscope. No other portions of 

 the daughter were examined, but the lungs, heart, liver, spleen 

 and kidnej^s of the mother were found to be unaffected. 



The pork used was home-raised, and, according to the owner, 

 the animal did not at any time show signs of ill health. An 

 examination of two other hogs raised on the premises was made, 

 but no trichinae were found. As usual in such cases, the meat 

 was imperfectly cooked or fried, the tenderloin, sausage meat, 

 spare ribs, etc., all being freely used. For several days while in 

 water the human trichinae showed signs of life, coiling and 

 uncoiling when freed from the muscular fibre, but the stage of 

 development found in the pork showed no activity under the same 

 conditions. The communication is accompanied by excellent 

 photographs of portions of human muscle and of the affected 

 pork, showing a number of the worms imbedded in the tissue. 



May 18. 

 Mr. Geo. W. Tryon, Jr., in the chair. 

 Seventeen persons present. 



May 25. 



The President, Dr. Leidy, in the chair. 



Nineteen persons present. 



Charles P. Sherman was elected a member. 



The following was ordered to be printed : 



