British Association. ata 
enabling the man to see. Every part of this air-proof hood where the 
metal is fixed is water-tight. When this apparatus is about to be used, a 
soft, thick kerchief is to be wrapped smoothly round the neck, The hood 
and tippet is then put on. A band having been bound round the head and 
face over the hood, to keep the orinasal cover in its place, with a kerchief 
bound round the neck over the tippet, to prevent any foul air passing 
under it, the waistcoat and coat should then be buttoned and secured over 
the tippet for the same purpose. The means are so simple, and seem so 
slight, that a man may naturally hesitate to enter a poisonous gas with 
such protection; but if the apparatus be water-tight (which should be 
tested by trial with water, just before using it) he need not fear; for I 
have tried it repeatedly in the fumes of burning sulphur, in the sight of 
many witnesses, and it has never failed me. When the apparatus is used 
with an inhaling pipe extending into the pure air, the end may be fixed 
there, or held by an assistant, and conversation at the same time can be 
carried on between the wearer and his assistant through the pipe. . When 
it is used in this manner a cord may be fastened round the person using 
the apparatus, and the other end held by the assistant outside, so that the 
man may be hauled out, if, through any accident, such a proceeding should 
be necessary. When the apparatus is used with an air-bag, it is attached 
to the back, and one end of the inhaling pipe communicates with it. A 
smaller air-bag is also connected by means of its own pipe, having a stop- 
cock, with the common inhaling pipe. The use of this small air-bag is, 
that the man may have its contents in reserve as soon as his larger store 
is exhausted; that he may know it is time to replenish his bags when his 
larger bag is empty. It might be useful to have one or more bags of air 
furnished with stop-cocks, and proper unions kept in reserve in places 
such as coal mines, where they may be required, so that a man using the 
apparatus could attach a full bag to it when necessary. I again state that 
it is necessary to examine the apparatus before using it, and to fix it on 
carefully; for if a man should enter carbonic acid gas with it, and through 
any imperfection of the apparatus shall inhale for some time a poisonous 
gas (though only a small quantity), he may fall down insensible, and may 
lose his life, unconscious of his danger. 
‘On the Practicability of Arresting the Development of Epidemic 
Diseases by the Internal Use of Anti-zymotie Agents.” By Dr Rozinson. 
“On the Physiological Effect produced by several apparatuses con- 
trived for the purpose of causing a Vacuum upon the entire body, or a 
part thereof.” By Dr Junop.—Several important effects had been pro- 
duced, and among them the power of occasioning syncope at will, and 
thereby producing the condition most likely to arrest inflammation without 
the loss of power consequent upon the abstraction of blood. Besides the 
apparatus for an exhausting effect, Dr Junod proposed the converse of 
this remedial influence, and applied compressed air. For this purpose a 
large air-tight chamber is used, having the form of adiving-bell. The 
patient is seated within, and air forced in until the necessary amount of 
pressure is produce three, or more atmospheres. In the 
numerous experiments ‘made of this treatment, it would appear that in 
the proportion that the powers of vitality are diminished in the method of 
exhaustion, they are increased and rendered more active by that of com- 
pressed air. The kind of maladies which have been relieved or cured by 
the latter process are precisely those in which an atonic condition of the 
system exists. 
**On the Dietary of the Lancashire Operatives.” By Dr Epwarp 
SMITH, 
