. The microscope and its revelations. r areolatibn is here displayed; and it hence appears pro-bable that this marking belongs to the internal layer,1 and that thecircular areolation exists in the outer layer of the silicified the alternating divisions whose surface is here displayed, theareolation of the outer layer, when brought into view by focussingdown to it, is seen to be formed by equilateral triangles; it is not,however, nearly so well marked as the circular areolation of thefirst-mentioned divisions. The dark spots seen at the end of therays, like the dark centre, appear to
. The microscope and its revelations. r areolatibn is here displayed; and it hence appears pro-bable that this marking belongs to the internal layer,1 and that thecircular areolation exists in the outer layer of the silicified the alternating divisions whose surface is here displayed, theareolation of the outer layer, when brought into view by focussingdown to it, is seen to be formed by equilateral triangles; it is not,however, nearly so well marked as the circular areolation of thefirst-mentioned divisions. The dark spots seen at the end of therays, like the dark centre, appear to be solid areolations of silex nottraversed by markings, as in many other diatoms ; they are appa-rently not orifices, as supposed by Professor Ehrenberg. Of this , specimens are found presenting six. eight, ten, or twelve radialdivisions, but in other respects exactly similar ; on the other hand,two specimens agreeing in their number of divisions may exhibitminute differences of other kinds ; in fact, it is rare to find two.
Size: 1581px × 1581px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
