. The microscope and its revelations. Fig. Dr. H. Van Heurck, phM. Collotype Ptg. Co., zSa High Holborn, TEST OBJECTS FOR THE MICROSCOPE. Objective by C. Zeiss, roo; Eyepiece 12. Monochromatic illumination by sunlight. DIATOMACEJE 595 until these again reach their minimum size. This theory the judgment of Count Castracane, deceived many botanists,from the idea that it was founded on actual observation, and liasat the same time been in harmony with the natural tendency togeneralisation, in attributing to the whole family of diatoms thatfaculty of division which has been reg
. The microscope and its revelations. Fig. Dr. H. Van Heurck, phM. Collotype Ptg. Co., zSa High Holborn, TEST OBJECTS FOR THE MICROSCOPE. Objective by C. Zeiss, roo; Eyepiece 12. Monochromatic illumination by sunlight. DIATOMACEJE 595 until these again reach their minimum size. This theory the judgment of Count Castracane, deceived many botanists,from the idea that it was founded on actual observation, and liasat the same time been in harmony with the natural tendency togeneralisation, in attributing to the whole family of diatoms thatfaculty of division which has been regarded as the universal propertyof the vegetable cell. The auxospore theory rests on the supposedinability of the siliceous walls of diatoms to expand ; and implies,secondly, the idea that all diatoms are capable of binary sub-division ; and thirdly, that there is no mode of reproduction exceptby auxospores. That the siliceous walls of diatoms are capable ofdistension seems to result from the examples already given of and J
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