86 



HARD WICKE 'S S CIENCE - G O SSI P. 



features of modern literature, and they indicate the 

 course of thought, perhaps, more strikingly than any 

 other works. We have now to welcome Professor 

 Thome's "Structural and Physiological Botany," 



Fig. 77. Grooved Hammer. 



Fig. 78. Sling-stone. 



Fig. 79. Common type of Flint Flake. 



translated and edited by Mr. A. W. Bennett, B.Sc, 

 F.L.S., &c. (London: Longmans, Green, & Co.). 

 The work is embellished by 600 woodcuts, all of 

 which materially assist the botanical student. This 

 is the recognized text-book of botany in the German 

 technical schools, and its appearance in an English 

 garb is therefore required. No better or more trust- 

 worthy editor and translator could liave been selected 



than Mr. Bennett, who himself takes high rank 

 among our most distinguished botanists. The ar- 



Fig. 80. Barbed Flint Arrow-head from Derbyshire. 



rangement is both clear and exhaustive, and the 

 price (6s.) will, we hope, bring this most useful book 

 within the range of every intending student. 



MICROSCOPY. 



How TO FILTER WATER TO OBTAIN MiNUTE 



Organisms. — Upon this subject there are some 

 observations of Dr. A. Meade-Edwards in your 

 Febraary impression, and as it appears that a second 

 contribution may not be wholly unacceptable to the 

 readers of Science-Gossif, I beg to inclose a sketch 

 of a little piece of apparatus designed by me for the 

 same purpose some three years since, and then intro- 

 duced at one of the meetings of our Margate Micro- 

 scopical Society, to which I am honorary librarian, 

 and which has been found both portable and usefid 

 at the pond-side. Indeed, by its use, one may in 

 half an hour collect all the living organisms con- 

 tained in a butt of water, and carry home in his 

 breast-pocket a myriad of the larger and smaller fry 

 which abound in pond-life. The entire apparatus 

 costs only a couple of shillings, and was made for me 

 by a local tinman, and neatly finished off with a coat 

 of red sealing-wax varnish, a is one of the three- 

 inch jam-covers patented by Mr. Jennings, and con- 

 sisting of a disc of tin with an indiarubber ring (b) 

 beneath, by which an instant and air-tiglit joint is 

 effected with a glass tumbler or wide-moutlied bottle. 

 C is a small funnel with a double wire rim, and over 

 the mouth of which a piece of coarse muslin — ^simply 

 as a strainer, to arrest duckweed, bits of stick, &c. — 

 may be kept stretched by a small indiarubber ring, 

 which will lie between the two wire rings forming the 

 rim ; and D is a similar tin funnel, across the mouth 



