Show no nac bacteria terla in old books to ie virtually no danger of disease being spread by the books in libraries unless of course they have bavo been used recently by persons parsons having infectious diseases dl while cleana cleaning ng the library of yalo university tho the dust from tho the books wag chemically analyzed about halt of oc it was found to be mineral matter while the other halt half was raper paper liber fiber wood fiber and molde no bacteria such as are common lil in the mouth were found |