The Monthly Microscopical Journal; Transactions of the Royal Microscopical Society, and Record of Histological Research at Home and Abroad Volume 16 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1876 edition. Excerpt: ...by Professor E. W. Morley, whose communication is published ia the ' M. M. J.' of May last, p. 223. This Probe-Platte is the one marked C by him in his table of measurements on p. 226, and on this particular frustule he finds the transverse strise to range from 81-5 to 827 in 001." I think, therefore, it may fairly be called a representative frustule of the F. Saxonica, although apparently somewhat larger than those selected by Dr. Woodward for his photographs. The accompanying photograph J of this frustule, marked A, shows the longitudinal lines over the whole surface. I find them to be 88 in 001," but do not claim great accuracy in the measurement. It will be noticed that this frustule is in balsam, while the lines are therefore fainter than they would be in a dry mount, yet the balsam eliminates the principal cause of the disturbing spurious lines. The midrib and margin of this species are quite thick, and in very oblique light produce diffraction phenomena, which in some cases obscure the whole frustule, and usually leave but little of the real aspect perceptible; balsam, however, has a refractive power more nearly that of the silica, and in that medium the diffraction lines are quite within control. Eeprinted ' M. M. J.' vol. xiv. p. 279. t ' M. M. J.' vol. xiv. p. 274. J The photographs sent, those of F. Saxonica and A. pellucida, rather bear out the author's views. They are, however, hardly of sufficient interest to demand a Plate; we have therefore placed them with the other photographs which Mr. Wells has sent to us, in the hands of Hon. Secretaries of the Royal Microscopical Society.--Ed. M. M. J.' The illumination which I have used in taking this photograph was obtained from Wenham's reflex illuminator, used in the manner first...