. Contributions. Biology. F. G. Keyes and L. J. Gillespie 295. Fig. 1. Fermentation bulb fitted with vacuum stopcocks. B, bottle, secured bj' cotton plug, serving to keep sterile the capillary lead. Capacity of bulb, about 300 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 Brown University. Biological Laboratory. Providence, R. I

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