Exijerimetits on the Respiration of Melampus. 285 



Experiment 9. 

 June 1. Two specimens of Mekmpws ^^tta^is, from the same place, 

 were inclosed in separate bags, and immersed in the same 

 glass of sea-water. 



12. Both were dead ; the water never having been changed since 



June the 4th, when they were certainly alive. They were also 

 alive on either the 6th or 7th, but I cannot speak quite 

 positively. 



Experiment 10. 

 June 22. Two specimens of the same inclosed and immersed as above. 

 • 26. Both dead. The water has not been changed. 



Experiment 11. 

 June 26, Two specimens of the same inclosed and immersed as before. 



29. One dead ; the other sickly. The water was changed.* 



30. The survivor alive. 



July 1 . Dead. 



Experiment 12. 

 July 19. Two specimens of the same inclosed in bags, and immersed 

 in separate glasses of sea- water. 



20. Twenty-four hours after both are alive and healthy ; thirty 



hours after, one is sickly and retracted ; the other quite 

 healthy. 



21. The last is quite healthy; the other quite retracted, and, I 



think, dead. Water changed for both. 



22. Both quite dead. 



Experiment 13. 

 Aug. 10. Two specimens of the same inclosed in separate bags, were 

 immersed in the same glass of sea-water. 

 N. B. These are the two specimens mentioned in Experiment 8. 

 After the air had been expelled in the manner there described, they were 

 left covered by the water ; no more airrbubbles appeared. 



* The water was chan-red in this, and in all the experiments, by pouring in 

 gently the fresh, and suffering the contents of the glass to run over its sides till 

 the water was completely renewed. Thus, no part of the bags was ever for an 

 instant exposed to the air. Care must be taken to pour in the water gently 

 lest bubbles of air should be driven into the bags; which should also be well 

 soaked previously to the experiment, to expel every particle of the same. 



