BOOK FOUR . .. Rudo lf Virchow ( 1 821 · 190 21, a Ge rman sc ienti st , scholar, and phys ic ian, was t he found e r of ce llular pathology and hi s mos t important and mos t enduring labors were in the field of pathology, the study of diseases . ACTIVITIES Because of hi s great desire to impa rt to students a bet te r apprecia ti o n of God's magnifi cent universe through studying its inhabitants, this, the fou rth book of the 1937 Pe tit Jean, is dedica ted to STANLEY J . CARPENTER
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