. Boys and girls in biology : or, Simple studies of the lower forms of life. Biology. 22 BOYS AND GIRLS IN BIOLOGY. hot, and not to let it stand too near the fire. Take two bottles and half fill them with sweetened water, or, what is better, " Pasteur's fluid," 1 and sow just a drop or two of yeast in each, heat them both till they boil, and as they are cooling, cork them up with cotton, or " cotton- wool," as the English say. Let them stand for a few days, and there will be no signs of life in either, but if you place just one of the torul^e into one of the bot- Fig. 16. F
. Boys and girls in biology : or, Simple studies of the lower forms of life. Biology. 22 BOYS AND GIRLS IN BIOLOGY. hot, and not to let it stand too near the fire. Take two bottles and half fill them with sweetened water, or, what is better, " Pasteur's fluid," 1 and sow just a drop or two of yeast in each, heat them both till they boil, and as they are cooling, cork them up with cotton, or " cotton- wool," as the English say. Let them stand for a few days, and there will be no signs of life in either, but if you place just one of the torul^e into one of the bot- Fig. 16. Fig. Bottle of Yeast corked up with Porous Jar containing Yeast, showing Cotton. how the Fluids pass in and out, but the Cells do not. ties and cork it up again, the cell will begin to grow and multiply, or ferment, till the bottle bursts. The other bottle will remain perfectly quiet (Fig. 15); the Potassium phosphate 20 parts. Calcium phosphate 2 " Magnesium sulphate 2 " Ammonium tartrate 100 " Cane-sugar 1,500 " Water 8,376 " 10,000. 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 Stevenson, Sarah Hackett, 1843-1909; Huxley, Thomas Henry, 1825-1895. New York : D. Appleton and company
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbiology, bookyear1875
