The VentjJbööQ, Hea
J. W. THOMAS, F.I.C., F.C.S.
»-» scientist in ventilation and heating
■ JhE ventilation, hbating and management of churches and
fmkc Wildings"; "coal, mine-gases and ventilation," etc.
LONGMANS, GREEN, AND CO. 39 paternoster row, london new york a;n.0 bombay