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POPULAR SCIENCE EEYIEW. 
of clouds — a feat which ozone is not able to accomplish, although it may be 
allowed to remain in contact with this fluid for weeks. Whilst ozone is 
insoluble in water, antozone is said to have a powerful affinity for it.” In 
the chapter entitled Does the atmosphere contain ozone ?” Dr. Fox enters 
upon a very full and fair discussion of the subject. In this he gives us his 
numerous authorities, showing where ozone is most exhibited and where it 
is least developed, with different reasons for its presence or absence given 
by those who have made the subject a special study. In this we are led 
very strongly to reject the testimony as to its absence from certain towns — 
Lyons for instance — because of the extreme improbability of such an im- 
portant constituent of the atmosphere (if it is so) being not present in the 
atmospheric air of that city. We are inclined to think that far more numerous 
analyses than those on which Dr. Fox bases his views should be made before 
such a conclusion is openly expressed in public. And we have not the 
smallest doubt that minute observations will yet be made which will throw 
the author’s statement — made upon authority of others — completely into the 
dark. Still, admitting the justification of the work, we cannot help confess- 
ing that the author has done well in most parts of the book. We must, 
however, call him to task for some of the conclusions which he would 
appear to hold, or at least to give a place to. And foremost of such is his 
quotation of that monstrous doctrine of Mr. Haviland, that geological 
structure has anything — save in the case of swamps and such like — to do 
with special forms of disease. For example, he appears to accept that most 
absurd doctrine that heart disease and dropsy occur ‘‘ wherever the prevail- 
ing sea-winds have uninterrupted access, as over a flat or elevated country, 
or up broad valleys.” How Mr. Haviland’s doctrine could ever have gained 
the least attention is only to be explained by the utter ignorance that 
medical men yet have of geology and everything relating to it. Anything 
more absurd than to attempt a classification of diseases according to the 
geology of a country it is difficult to conceive. It is hard to imagine any 
two countries more dissimilar geologically than Ireland and England, or 
more alike epidemically — with the one exception of typhus, or famine fever, 
which is easily explained by the former poverty of the inhabitants of 
Ireland. Dr. Fox gives several very good reasons why ozone should be 
observed, and we think his book is likely to increase the number of 
ozonometricians at present existing. In all that concerns methods of 
recording ozone his book is a veritable mine of wealth ; more than half of 
it is devoted to this subject, and so far as we have seen, with clearness and 
comprehensiveness. Indeed, altogether we are much pleased with the 
volume 5 and leaving aside the question whether it should have been pub- 
lished, we feel bound to award the author our best praise for the manner 
in which he has discharged the task which he undertook. 
