306 THE LAWS OF ORGANIC 



trembling. of the lips, and cessation or palpitation 

 of the heart. At times the attack is so instan- 

 taneous, that the individual presents few of these 

 precursory signs. 



CCCXL. The subject of nausea has been stu- 

 died by almost every physiologist ; but we possess 

 at present no theory concerning it which is 

 deemed satisfactory. The derangement in the 

 circulation of blood in the head has generally 

 been received as constituting the proximate cause. 

 The reasonings which I shall employ, and the 

 facts which I shall adduce in support of them, 

 conjoined with the operation of remedial mea- 

 sures which are found to remove or alleviate the 

 feeling, will probably throw some light upon the 

 subject. 



CCCXLI. Nausea, in whatever way it is pro- 

 duced, whether by the recollection of something 

 painful or some immediate affection of the senses, 

 or whether from the undulating motion of a 

 vessel, or the removal of an hydropic fluid, has 

 the same proximate cause an overcharged state 

 of the lungs. 



CCCXLII. In every instance, nausea arises 

 either from a sensation communicated by the 

 brain to the respiratory functions, or from a 

 sensation occasioned by a peculiar state or change 

 of the general system, and which is immediately 

 transmitted to the cerebrum, and afterwards re- 



