Mechanism of the Act of Vomiting. 267 



quite indifferent on which side of the diaphragm the stomach 

 may be placed, whether above, as in the case of hernia, or 

 below, in its natural situation. 



The view of the act of vomiting which I have taken, appears 

 to me to be the only one which at once explains this act, as it 

 occurs in the case of hernia of the stomach through the dia- 

 phragm, such as the one detailed by Dr. Graves and Dr. Stokes; 

 and the experiment of M. Magendie, in which a bladder was 

 substituted in the place of the stomach. The first establishes 

 the fact> that the diaphragm, the second, that the stomach, 

 has no necessary part in vomiting. It remained, therefore, to 

 shew in what other manner the act of vomiting, and both of 

 these facts, would admit of explanation. This is done in the 

 manner already detailed. And the truth of the explanation is 

 proved by two decisive experiments, related in the paper to 

 which I have already referred. 



FURTHER EXPERIMENTS ON THE COMMUNICATION OF 



PHOSPHORESCENCE AND COLOUR TO BODIES 



BY ELECTRICITY. 



BY THOMAS J. PEARSALL, 



Chemical Assistant in the Laboratory of the Royal Institution. 



TN a former communication (page 77 of the Royal Institution 

 Journal) I observed, that those phosphori which are distin- 

 guished for their property of evolving light when heated, and 

 which, under ordinary circumstances, allow of no repetition of 

 this effect, could have the property restored to them by the 

 agency of the electric discharge. I now purpose to offer some 

 additional experiments and remarks upon this induction of 

 phosphorescence. 



From the results obtained, there was reason to anticipate that 

 not only all such phosphorescent bodies might have this pro- 

 perty modified, increased, restored, or imparted to them by 

 the agency of ordinary electricity, and the effects be alternately 

 produced and destroyed any number of times, but also that 



