. Bulletin. Science; Natural history; Natural history. 80 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES c (D O ;^ 0) Q. 100 - 80- 60 40 20 - ^ -15 -10 o > O 100 - o CO 80 - o I- soH o <D 40 OS 20 -15 -10 -5 100 - 80 60 40 20 - â 15 -10 Control Experimental 1986. 10 15 20 25 1987 Control jmental. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy

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Keywords: ., bookcentury1900, booksubjectnaturalhistory, booksubjectscience