AND ANIMAL LIFE. 311 



CCCL. Children are less frequently sick on 

 board a vessel than adults. They are either de- 

 lighted with the changes and novelties of 'the 

 scene, or they are too unconscious and unsettled 

 to fix their attention on the vary ing objects around 

 them, in consequence of which the respiration and 

 circulation remain in their natural state ; no dis- 

 agreeable impression is transmitted to the senso- 

 rium, nor is the mind, from their years, capable 

 of that reflexion which readily communicates 

 the influence of mental anxiety to the respiratory 

 functions. 



CCCLI. Delicate females are more easily af- 

 fected at sea than the robust of their sex. Me- 

 dicines to which we are unaccustomed often pro- 

 mote sickness, although not intended to produce 

 this effect, but, if frequently repeated, they 

 can be taken with comparative ease ; and the 

 great class of those agents which never enter the 

 system, but which operate exclusively upon the 

 mind, occasion results precisely similar to those 

 which are the consequences of emetic substances 

 in contact with the mucous membrane of the 

 stomach. 



CCCLII. Having divided the remote causes 

 of Syncope into two general classes, I shall say a 

 few words concerning the first, and its subdivi- 

 sions : that is, into those heads in which we have 

 sensations that are derived from the senses and past 

 impress ions , and into pleasurable or painful states 

 of the body. 



