W. p. G. Bartlett on Interpolation in Physics and Chemistry. 27 



be ia 



served, and thus it can be seen, just how far < 

 how far to fall. Persons will frequently find, that the view of 

 the waves has a beneficial effect in stilling nausea, suffered 

 more severely in the cabin. This is not only on account of the 

 fresh air on deck, but because in the cabin, the idea of motion is 

 more undefined. The view of the horizon also, has a most ben- 

 eficial effect. The horizon is the only object which has the 

 appearance of remaining stationary, and the motions of a ship 

 are readily graduated by keeping the gaze directed to it. On 

 deck the miserable sea-sick passenger can breath the fresh air, 

 in lieu of the conglomerate smells in a cabin aboard ship. He 

 can also choose a position amid-ships, where there is the least 

 motion of any place on deck. Then there are more agreeable 

 objects to look at on deck, and beyond, than in the cabin, and 

 it is very important that the mind should be distracted from the 

 passing scene— or, what is disagreeable or most so in it. In a 

 foot-note, I have adverted by a quotation to a case, where a wo- 

 man who had been prostrated for some days by sea-sickness, was 

 immediately and completely cured, owing to the action of terror 

 on her mind, resulting from the belief that the ship was found- 

 ering, and this case is by no means isolated. 



' iition to what has been recommended, the passenger 

 a mattress, and put himself in a recumbent posture, 

 m have been done, that can be done, to prevent, to 



re, or to alleviate sea-sickness, until the education of the senses 



completed. 



will spr< 

 all will 



Art. III.— On the Empirical Interpolation of Observations in 

 Physics and Chemistry; by W. P. G. Bartlett. 



The object of the present paper is to bring to the notice of 

 physicists some methods of interpolation ; not that there is any 

 principle in them new to mathematicians, but because no proper 

 methods appear to be practically within the reach of many of 

 those engaged in making such observations in physics and chem- 

 istry as require interpolation. 



Whatever difficulty there is in the problem anses from our 

 entire ignorance of the form of the function which the observa- 

 tions follow, and from the necessarily irregular intervals at which 

 ttey are made. 



Every method of interpolation under these conditions amounts 

 to assuming some formula involving arbitrary constants, and de- 

 termining the values of these by elimination from the f —'' — 

 furnished by the observations. 



