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days old, each five worms from the same place from which the 

 others were obtained. Repeated the feeding on April 22d, 23d, 

 24th, 25th, 26th and 27th. On April 28th, about seven days 

 from the first feeding, all had the gapes. One was now killed 

 and Syngami found in the trachea, also three pairs in the lower 

 part of the left lung and one pair in the lower part of the right 

 lung. Continued to feed the two remaining chicks earthworms 

 until May 5th, just two weeks from the first feeding, when one 

 was killed and the lower part of the trachea found crowded with 

 Syngami. One of these measured seven-eighths of an inch in 

 length, and two or three others three-fourths of an inch They 

 contained fully developed eggs, as did also the excretions of the 

 chick just before it was killed. This proves that the embryo of 

 Syngamus in the earthworm, is developed to maturity in two 

 weeks from the time it obtains entrance to the chick. The last 

 chick was killed seventeen days from the first feeding, when in 

 articulo mortis. In the lungs of each of those killed at fourteen 

 and seventeen days from the first feeding, embryo Syngami 

 were found in various stages of development. 



Exp. 10. On July 16th, fed a chick ten earthworms, and re- 

 peated the feeding for nine successive days. The gapes observed 

 on the seventh day, as usual. • On July 26th, ten days from the 

 first feeding, I killed this chick and found a large number of 

 Syngami in the trachea, and also the embryos in different stages of 

 growth in the lungs. 



Exp. 11. In order to see if Dr. Megnin's theory was correct, 

 that the eggs would develop within the fowl, I fed a chick about 

 three weeks old, on July 29th, three perfect Syngami, containing 

 many thousands of eggs. This chick was carefully watched for 

 five weeks, and no symptoms of gapes observed. That this re- 

 sult is correct, we have additional proof in exp. S, in which 

 large numbers of perfect eggs were found in the excretions of 

 the chick, on the fourteenth day after feeding earthworms con- 

 taining the embryos of the gape worm. I believe, however, if 

 the eggs should in any manner be retained so as to hatch before 

 they passed into the proventriculus, the gapes would be pro- 



