66 



dium), lime (oxide of calcium), and wood ashes (mostly com- 

 posed of potassaand its carbonate). In the experiments medium- 

 sized earthworms were used and the embryos of syngamus were 

 taken from the intestine of the earthworm. 



EXPERIMENTS WITH EARTHWORMS AND EMBRYOS OF 



SYNGAMUS. 



Exp. 1. An earthworm just dug, and with the dirt still adher- 

 ing to it, was thrown into dry lime which had been slacked for 

 several weeks. At the end of twelve minutes it was dead. 



Exp. 2. Another earthworm was thrown into lime-water; in 

 seven minutes it ceased to move. 



Exp. 3. An embryo of Syngamus trachealis was placed in 

 lime-water; it was observed for two hours, at the end of which 

 time it was still alive and active. 



Exp. 4. An earthworm placed in a solution of common salt 

 having the strength of one-fourth pound to the gallon of water. 

 In six minutes it was dead. 



Exp. 5. An embryo of Syngamus placed in the above solu- 

 tion lived thirty-three minutes. 



Exp. 6. An earthworm placed in a solution of salt having 

 the strength of one-half pound to the gallon of water lived 

 four minutes. 



Exp. 7. An embryo of Syngamus placed in the above solution 

 ceased to move in fourteen and one-half minutes. 



Exp. 8. An earthworm placed in a salt solution having the 

 strength of one pound to one gallon of water lived about three 

 minutes. 



Exp. 9. An embryo of Syngamus placed in the above solution 

 lived three minutes. 



Exp. 10. An earthworm thrown on a portion of dry salt ceased 

 to move in somewhat less than three minutes. 



Exp. 11. An earthworm thrown on dry ashes lived about 

 twelve minutes. 



Exp. 12. An earthworm placed in lye made by pouring warm 

 water on wood ashes and letting it stand one hour, the propor- 



