CIASS IV. 3. 4. 1. OP ASSOCIATION. 443 



ORDO in. 



Retrograde Associate Motions. 



GENUS IV. 



Catenated with External Influences. 

 SPECIES. 



1. Catarrhus pcriodicus. Periodical catarrh is not a very un- 

 common disease: there is a great discharge of a thin saline mu- 

 cous material from the membranes of the nostrils, and probably 

 from the maxillary and frontal sinuses, which recur once a day 

 at exact solar periods; unless it be disturbed by exhibition of 

 opium; and resembles the periodic cough mentioned below. See 

 Class I. 3. 2. 1. It is probably owing to the retrograde action of 

 the lymphatics of the membranes affected, and produced imme- 

 diately by solar influence. 



2. Tussis periodica. Periodic cough, called nervous cough, 

 and tussis ferina. It seems to arise from a periodic retrograde 

 action of the lymphatics of the membrane, which lines the air- 

 cells of the lungs. And the action of coughing, which is violent 

 for an hour or longer, is probably excited by the stimulus of the 

 thin fluid thus produced, as well as by the disagreeable sen- 

 sation attending membranous inactivity; and resembles periodic 

 catarrh not only in its situation on a mucous membrane, but in 

 the discharge of a thin fluid. As it is partly restrainable, it does 

 not come under the name of convulsion; and as it is not attended 

 with difficult respiration, it cannot be called asthma; it is cured 

 by very large doses of opium; see a case and cure in Sect. XXXVI. 

 3. 9. See Class IV. 2. 4. 6. and seems immediately to be induc- 

 ed by solar influence. 



3. Hysteria a frig ore. Hysteric paroxysms are occasioned by 

 whatever suddenly debilitates the system, as fear, or cold, and 

 perhaps sometimes by external moisture of the air, as all delicate 

 people have their days of greater or less debility. See Class IV. 

 3. 1. 8. 



4. Nausea pluvialis. Sickness at the commencement of a 

 rainy season is very common among dogs, who assist themselves 

 by eating the agrostis canina, or dog's grass, and thus empty 

 their stomachs. The same occurs with less frequency to cats, 

 who make use of the same expedient. See Sect. XVI. 11. I 

 have known owe person, who from his early years has always 



