APPENDIX — APNCEA AND DYSPNOEA. 655 



become fewer, notwithstanding the increase of carbonic acid in 

 the blood to which their diminution gives rise, and if the dose 

 be large they may stop altogether. Apnoea may also be 

 produced by means of artificial respiration with great ease 

 after their administration, and it may last so long, that one 

 is sometimes inclined to think that the animal is not going to 

 breathe again at all. 



