In the 8th number of the Journal, published in July, 1854, there is an account of the circulation in the Closterium lunula, by the Hon. and Rev. Mr. Osborne, and Mr. Hogg. This circulation, according to Mr. Hogg, is “no new discovery,” but to me, as a young microscopist, I must confess it was so, as until I applied the parabolic reflector of Mr. Wenham, with the assistance of direct sunlight, I have never suspected it to exist. By this means of illumination, however, it appears to me to be very distinct, although I have seen it to better advantage in C. acerosum.
Some time in April last I met with some good specimens of this plant, and with -inch objective of Smith and Beck their No. 1 eye-piece, Mr. Wenham’s reflector, and a prism instead of mirror, with the assistance of direct sunlight, I had repeatedly the...
