. Journal of applied microscopy and laboratory methods. Fig. 4.—Early telophase of mitosis in Ascaris megalocephala var. bivalens; polar bodies at i; egg-cell wall at 2. Centrosome divided just below polar bodies, x 1500. apparatus; microscope stand, lenses, camera, and illuminating appliances, dedi-cated to this one work ; mounted to stay, on tables adapted to the purpose,resting on a floor that cannot be jarred, with a fully equipped dark room imme-diately at hand. The essentials of such an apparatus will be fully described in asucceeding Fig. 5.—Mitotic figure from pollen mother-cel
. Journal of applied microscopy and laboratory methods. Fig. 4.—Early telophase of mitosis in Ascaris megalocephala var. bivalens; polar bodies at i; egg-cell wall at 2. Centrosome divided just below polar bodies, x 1500. apparatus; microscope stand, lenses, camera, and illuminating appliances, dedi-cated to this one work ; mounted to stay, on tables adapted to the purpose,resting on a floor that cannot be jarred, with a fully equipped dark room imme-diately at hand. The essentials of such an apparatus will be fully described in asucceeding Fig. 5.—Mitotic figure from pollen mother-cell of Lillium by Prof. David M. Mottier. x 1500. and Laboratory Methods. 1403 With such an apparatus, ten first quality negatives, of any diameters from4000 down, can easily be made in a couple of hours. They can be more easilyand certainly made than the same number of fair to middling negatives of from40 to 100 diameters on any improvised outfit. .^^^- Fig. 6.— Unsectioned blastula of ascaris. x 1500. This makes photomicrographs of all powers really usable. Previous to1899, experts were happy with ten failures to one success; one correct negativehad to pay for an entire evenings work. This made them expensive, tooexpensive for any use, however cheap the apparatus. Earlham College. D. W. DennIS. Notes on Testing for B. Coli in Water Test for B. Coli in Large Volumes. In 1898 we published a description of the methods employed at the LawrenceExperiment Station in the routine examination of water for B. coli. These testswere
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
