Show Dis infecting disinfecting schoolrooms schoolroom in the course of a report on the alv dl infection of schoolrooms W if 11 marsh an english science teacher asserts that tests made of samples of schoolroom dust dost showed the number of rot ml cro cra thereto to be from 69 60 to 80 90 an ounce on some das da 8 as touch much as one and one quarter loinda poinda of dust was inept from a room quare feet in area which on an the baste of the figures au quoted cited would yield from to microorganisms micro organisms |