380 On Certain Bacteria from the Air of New York City. 



Nitrate solution. Eosoltc actd bkoth. 



Peptoii, 1 gr. Fepton, 10 gr. 



Potiissium nitrate ( KNOg ), . . 0.2 gr. Salt, 5 gr. 



Water, 1000 cc. Water, 1000 cc. 



Eosalic a«id solution, 40 cc. 



(Rosolic acid solution made of ro- 



salic acid .^ gr., alcohol, 80 per cent., 



100 cc. ) 



Pepton salt bkoth. Potato. 



Pepton, 1 gr. Oi-dinary potato, sliced, boiled and 



Salt, 1 gr. rendered alkaline. 



Water, 1000 cc. 



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