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of warmer or cooler ; innumerable patients attribute 

 to them different effects, and are afraid to loose time 

 so long as they drink what they call the mild or 

 weak waters. Those erroneous opinions are easily 

 rectified at Carlsbad by their medical adviser 5 but 

 they may be attended with the most serious conse- 

 quences , if foreign physicians, taking for granted 

 that we have weaker and harmless springs, send us 

 patients, who very soon experience that neither one 

 spring nor the other can agree with them. Certain 

 individuals have, no doubt, a kind of elective attraction 

 for one source or for the other, and obtain from 

 that spring all sorts of good effects . whilst another 

 or? will act perhaps differently. Such individualities 

 must be attended to and particularly respected , but 

 the closest attention to the effects of our various 

 wells is insufficient for classing them a priori, accor- 

 ding to the diseases in which they prove more or 

 less useful. The great question, in sending pa- 

 tients to Carlsbad, is not to decide which source they 

 should drink, but whether our waters are indicated 

 or not. I have treated at full length this important 

 subject, in the Almanack, for 1832, ch. III. 



I have met with a few ignorant hypocondriacal 

 patients, afraid of the green stuff surrounding our 

 wells fConfervae thermales) , because they suppose 

 it to be vert - de - gris . We hope that such a fancy 

 never can perplex any one who has read, in the present 

 opuscule, the interesting observations of Mr. Corda 

 upon those remarkable animal creatures. 



