Dr Clark on the Influence of Climate. 361 



an hour, to soften the corns : as much of the corn should then be re- 

 moved, by means of a sharp knife, as can be done without making a 

 wound : the corns and surrounding skin are then to be moistened with 

 water, and the nitrate of silver is to be rubbed on the corn very freely, and 

 lightly on the skin, so as not to occasion vesication : the part is then to be 

 fxposed to dry. 



** Little advantage would be derived, if nothing more were done, as the 

 black eschar would remain on the corn for some weeks, and during that 

 time the corn [would form a-new. About the fourteenth it will be observ- 

 ed that the cuticle is peeling off around the corn : this is the proper time 

 for putting the feet in warm water again, and for removing the eschar, and 

 as much as possible the corn underneath, by the knife. At this period 

 there is a distinct mark between the surrounding healthy cuticle and the 

 corn, so that the latter may be removed more effectually than at first. The 

 nitrate of silver is to be again applied as before. This plan is to be re- 

 peated until the corn be perfectly destroyed." P. 177. 



VI. The Influence of Climate in the Prevention and Cure of Chronic Dis- 

 eases, more particularly of the Chest and Di<restive Organs : Compris- 

 ing an account of the principal places resorted to by Invalids in England 

 and the South of Europe ; a comparative estimate of their respective merits 

 in particular diseases ; and general directions for Invalids while travel- 

 ling and residing abroad. With an Appendix, containing a series of Tables 

 on Climate. By James Clark, M. D. Member of the Royal College 

 of Physicians of London ; Corresponding Member of the Royal Medical 

 Society of Marseilles, of the Medico- Chirurgical Society of Naples, of 

 the Medical and Physical Society of Florence, of the Academy of Sciences 

 of Sienna, &c. &c. London, 1829. pp. 328. 



The author of this work has been already advantageously known to the 

 public, by a small volume of " Notes on the climate and medical institu- 

 tions of France and Italy;" but in consequence of enjoying additional op- 

 portunities of observation, he has been led to treat the same subject under a 

 much more comprehensive and philosophical aspect. That such a work 

 was much wanted, not only by the medical profession, but by the nume- 

 rous invalids who seek the recovery of their health in foreign countries can- 

 not be doubted, and while its author has endeavoured to accommodate it 

 to the perusal of the latter, he has attempted to preserve its utility to the 

 former. 



Dr Clark's work is divided into two parts. The first part treats of the 

 general physical characters of the milder climates of the South of Europe 

 and of England, and the author has pointed out the manner in which the 

 climate of different places is modified by local causes, and has compared 

 these places relatively to their influence on diseases. In this part, the au- 

 thor considers the climates of England, France^ Nice, Italy, and Madeira. 



As an example of the relative influence of climate in casts of confirmed 

 and incipient consumption, we shall quote the observations made by Dr 

 Renton and Dr Heineken in Madeira. 



According to Dr Renton's own observations, the following were the 

 comparative results. 



