rge rectangular panels set in a frameal strips, and ture ed slightly.

    “I sa,” Roger said, “and I t t be like it, so I lifted em, and t lift up. Me and tried it one nigory, before took here and you can crawl inside....”

    “he ceiling?”

    “I dunno. e just  in a little ime heyd probably find us.”

    Lyra sa not as a  as a   t before talk any more, a doctor banged on a table o speak.

    “Listen, cen carefully. Every so often ant t  dressed properly and make our side  any panic. So o ice fire drill ternoon.  stop  gros t go to if theres a real fire.”

    ell, t Lyra, theres an idea.

    During t part of ternoon, Lyra and four otested for Dust. tors didnt say t  it o guess. taken one by one to a laboratory, and of course tened;  , if s striking a blo t t going to do t operation just yet, it seemed.

    “e  to make some measurements,” tor explained. It ell te coats and oo, trange bland calm manner making ters.

    “I erday,” Lyra said.

    “A measurements today. Stand on tal plate—o. s it, stare at ttle green light. Good girl...”

    Sometor made o left and rigime something clicked and flashed.

    “ts fine. Noo t your o tube.

    Noto raigs it.”

    “ are you measuring?” s Dust?”

    “old you about Dust?”

    “One of t kno dusty, at least I dont terday.”

    “As a different sort of dust. You cant see it . Its a special dust. Nos rig of  t? take , t your othis way—

    rest it on t tingling, noto , its just a slig....”