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Página 299 - XVIII. The Nature of Light. With a General Account of Physical Optics. By Dr. Eugene Lommel. With 188 Illustrations and a Table of Spectra in Chromo-lithography.
Página 213 - No connection can be traced between the numbers of bacteria, spores, &c., present in the air and the occurrence of diarrhoea, dysentery, cholera, ague or dengue ; nor between the presence or abundance of any special form or forms of cells, and the prevalence of any of these diseases.