CH. III.] RESPIRATORY MOVEMENTS. 151 



252), and in as far as it is a foreseeing of a future agreeable 

 sensation of respiration, causes the necessary respiratory movC' 

 ments imperfectly (271). The instinct itself brings forth the 

 ^effort of the animal- sentient forces to produce these same 

 imperfect respiratory movements (272), and acts consequently 

 m the parts subservient to respiration, the diaphragm, the 

 luscles, &c., since it stimulates these to their natural fiinc- 

 ions, and which the satisfaction of the instinct, namely, 

 ispiration produces perfectly (208, 214). The result is, that 

 this instinct the mouth is opened, the muscles exert them- 

 jlves to raise the ribs, and the diaphragm is forced downwards, 

 )eing evidently the movements necessary to respiration, which 

 jontinue, according to the laws of the actions of sensational 

 instincts, until respiration is actually restored (257); then 

 there results, according to the connection of the physical, 

 lechanical, and animal forces of the parts subservient to re- 

 spiration, further actions in the animal economy, namely, the 

 expansion and contraction of the lungs, the determination of 

 the circulation of the blood, the cooling of the blood, perhaps 

 the transformation of the chyle into blood, and many other 

 uses, in accordance with the design of nature, which may 

 be learnt in detail in works on physiology. {Vide Haller, § 8.) 

 Since in the natural condition, animals are able to satisfy this 

 instinct volitionally almost instantaneously after birth, it does 

 not continue so long a mere instinct as others, and probably 

 this is the sole reason why respiration has not been hitherto 

 recognised as the sentient action of an instinct. Haller has 

 fully shown, that it is a sentient action, {vide §§ 268, 273, of 

 that great man^s ^ Physiology,' for a lucid explanation of the 

 question;) and it is surprising, that his doctrine has not only 

 been opposed, but he has even been blamed for advancing it. 



Other questions arising out of this subject will be referred 

 to again (526), or may be solved by the principles already 

 stated. Of this kind are the questions, whether respiration be 

 not at first and in the newly-born a nerve-action, or whether 

 it be not rather a nerve action in them (269) continued 

 afterwards by the co-operation of a sentient instinct (183), 

 resulting from the habit of sensation in the machines (51); or 

 whether it is not so little mechanical, that at each retardation 

 of the respiration the instinct scarcely induces its recom- 



