REVIEW—GROGNIEr’s LECTURES. 
499 
nier, asserts, that an elevation of 250 or 300 toises is perfectly 
safe, even in the neighbouyhood of the Pontine marshes. Thus, 
in what relates to these emanations, and in many other parts of 
therapeutics, data, well determined, are still wanting ; and we are 
compelled to continue a course of observation and study in guid¬ 
ing ourselves by the knowledge we have already acquired. Po¬ 
sitive science we can never have. Reason only requires that, in 
cases of doubt, we should rather err through excess of caution 
than in any other way. 
The morbid animal emanations having as their character the 
power of producing diseases similar to those of the animals from 
which they proceeded, and of acting equally as powerfully in small 
as in large quantities, the result being always the same—the pro¬ 
duction of a similar disease—these have constituted another sub¬ 
ject of study which has not been neglected by M. Grognier. 
The fourth number is terminated by the influence of the 
seasons on the health of domestic animals. That on climates 
is reserved for another course. Frequently, each object re¬ 
quires to be examined under more than one point of view, 
in order to be well understood. In several chapters, M. Grog¬ 
nier reserves to himself the completion of his subject to a future 
period, when he will resume the consideration of the matter. 
This method, which is necessarily a little abstract, has also its 
advantages ; it is the most rational, and is best calculated for oral 
or written instruction ; and there are lessons now published in 
this work which will not readily be forgotten. The instruction 
will be complete when the course is terminated, and until then all 
judgment would be premature ; and we must content ourselves 
with saying, that all his engagements are most scrupulously ful¬ 
filled ; that the work of our friend is an honest one; that from 
all that is known of M. Grognier, and the direction which he has 
given to his researches, and his labours, the greatest interest will 
be attached to the work which he has undertaken. 
Recueil de Med. Vet.y April 1833. 
Extract from the Public Sitting of the Royal and Central So¬ 
ciety of Agriculturey on Sunday, April 29, 1833. 
Report of the Concours for the distribution of prizes for the 
best essays, memoirs, and observations on veterinary medicine: 
