FUMIGATIONS TO DESTROY CONTAGION. 351 



by sliding horizontally into grooves at the bottom of two 

 uprights. To these uprights a cap must be fixed, through 

 which passes a screw, to raise or lower the stopple by means 

 of a nut in a sliding cap, to which the piece of plate glass 

 is to be cemented. 



An inspection of the figures, PI. X, Figs. 5 and 6, will 

 show the form and dimensions of every part of this little 

 apparatus, which should be wholly of wood, without iron 

 or any other metal, and the construction of which requires 

 nothing extraordinary or at all expensive. 



A a small square of wood, into which are fixed the two 

 uprights, B B. 



C a glass tumbler, cemented into a little movable piece 

 of wood, rf, which is secured by a groove in each of the 

 uprights. 



E a wooden screw, passing through the upper cross piece 

 F, and carrying the movable cross piece G, which slides on 

 the two uprights by means of a groove at each end. 



11 the plate of glass performing the office of a stopple, 

 and cemented to the under side of the movable cross piece. 



The vessel being thus arranged, and its capacity being 

 we will suppose 7 decil. [near l\ pint], pour in first a de- 

 cilitre [3\3G9 oz.] of nitric acid, of the strength mentioned 

 above, and then an equal quantity of muriatic acid ; add 

 40 gram. [618 grs.] of black oxide of manganese pow- 

 dered; and immediately close the vessel by screwing down 

 the stopple. These proportions are assigned from the ne- 

 cessity of leaving at least two thirds of the capacity of the 

 tumbler empty. 



If the contagion were considerable, or if the foci from In large or very 



which it issued were sufficiently numerous, to renew it in a foul P laces two 



* or more neces- 



short time, H would be advisable to have two or three such sary. 



apparatuses in the length of the ward. 



In a place less extensive than I have hitherto supposed, In some ca>es 

 j- ... i t j a large wide 



in a ward for instance containing but ten or twelve beds, or mou thed phial 



in- a public room where the air is vitiated only by a tempo- suflkient. 



rary accumulation of animal effluvia," we might employ, in- i 



itead of one of these tumblers, a wide mouthed stopple 



bottle, such as the glassmen sell for the use of chemists. 



Their 



