AND ITS EFFECTS UPON ANIMAL LIFE. 



39 



tin tubing of i|^ centimetres internal diameter. ^ represents the Chapman water pump attached 

 to the faucet. 



The dust filter, c, is twenty centimetres in length, consisting of a narrow portion four centi- 

 metres long and three millimetres in internal diameter, and of a wider portion sixteen centimetres 

 long and twelve millimetres in internal diameter. 



The condenser was cleansed by rinsing it with a solution of bichromate of potash and sulphuric 

 acid, then removing all trace of this solution by rinsing it rejjeatedly with twice distilled water. 

 The cleansing of the apparatus was greatly facilitated by attaching it to a Chapman water pump in 

 the laboratory, and drawing the cleansing solution and distilled water through it in large quantities- 

 It was then placed in the inverted bell jar, packed in ice, and connected with the meter and pump 

 in the hospital ward. 



Fig. 4. — .\pparatus used In condense moisture from the air of tlie Hospital Ward. 



With this apparatus a small amount of fluid was collected on days when the atmosphere was 

 saturated with moisture, but if this fluid was allowed to remain in the receptacle during several days 

 of clear weather it slowly evaporated. However, enough fluid was collected in this manner to 

 make several determinations of the free and albuminoid ammonia in it. The results thus obtained 

 are shown in Table D ; the first and third experiments showing results obtained without placing a 

 dust filter of asbestos before the condenser. The second and fourth experiments show the results 

 obtained by attaching such a dust filter. 



Table D. 



determination of free and albuminoid ammonia in the moisture condensed from the 



air of the hospital ward. 



Microscopic examination of the fluid condensed from the air of the hospital ward showed : a 

 number of small amorphous particles — black, yellow, and colorless ; a few small crystals, a few 

 epithelial scales, small bits of vegetable fibre, and a few bacteria. 



Cultures made from this fluid showed numerous colonies of moulds, numerous common air and 

 water organisms, some of which rapidly liquefied the gelatin of the cultures. B. pyocyanus was 

 found in one instance, in others a yellow sarcina, and yeasts of different colors. Besides these a 



