. The effect of age on habit formation in the albino rat ... Animal behavior; Rats. 41 TWO HUNDRED DAY BATS Pig. o en 5 ^ M 4 S3 M 2. UNIT = 1 10 20 30 40 oO 60 70 30 dO 100 110 120 HUMBBR OP TRIALS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hubbert, Helen Brewster, 1887-. Baltimore, Md.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanimalbehavior, booky