It contained five young ones, and was composed of fine grey pushm or wool resting on an understructure of moss."
"The Nests and Eggs of Indian Birds, Volume 1"
Allan O. Hume
We esteem man to be such only when we believe that we can influence him by words, by arguments that are directed to reason, which is the birthright of man, and when we are able to prevail upon those sentiments of his which, as peculiarly human, appear to be almost the foundation and the understructure of rational activity.
"The Reform of Education"
Giovanni Gentile
There it sat in the middle of the glinting river, its sturdy understructure reposing upon Waring's reef.
"Pee-Wee Harris Adrift"
Percy Keese Fitzhugh