8. In Kansas the brush mouse is confined to systems of cliffs that are wooded and that are at least 40 feet in height.
9. The brush mouse may be confined to cliffs in part by activities of other rodents.
10. The brush mouse commonly associates with the pack rat.
11. Laelapid mites have been found on specimens of P. b. attwateri.
12. Larval ixodid ticks were found on specimens of P. b. cansensis.
13. Acorns seem to be the chief food of the brush mouse; insects and seeds are also commonly eaten.
14. The brush mouse is adapted for climbing and probably for a partly subterranean life.
15. P. b. attwateri breeds in winter, as well as in other parts of the year.
16. P. b. cansensis is known to breed in early April.
17. The highest number of embryos obtained from a brush mouse in Kansas is five.