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293 
Fig. 104.— Trillium grandiflorum: photomicrograph of longitudinal section of root-tip, 
fixed in chromo-acetic-osrnic acid at 1:00 p.m., and stained in iron-alum haematoxylin. Eastman 
Commercial Ortho film, Wratten H filter (blue); Spencer 2-mm. fluorite objective; ocular X6; 
arc light; exposure, 12 seconds. Negative by Dr. P. J. Sedgwick. X 1,174. 
