Контекст: 27 white rats died within a month, mostly from bronchopneumonia, after twice weekly exposures to an aerosol of unknown airborne concn generated from an aqueous 40% NaOH solution. When exposed to an aerosol generated from aqueous 20% NaOH solution, the septa were emphymatously (sic) dilated and cracked, the bronchi were dilated and their epithelial cover was thin and frequently desquamated, and a light roundcell infiltration of the submucus membrane tissue occurred.

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