HARDWICKE'S SCIENCE-GOSSIP. 



" West Yorkshire," its Geology, Climatology and 



Botany, by J. W.Davis, F.L.S., and Arnold Lees, 



F.L.S. 1874 (?), 2tt. ; Reeve. 

 " Castle Howard," North Riding, Of the more rare 



plants of, by Robert Teesdale, Trans. Linn. Soc. 



1792, vol. ii. pp. 103. 

 "Settle, A Catalogue of plants, &c. of," published 



with Curtis's "Flora Londinensis," 1782, folio. 



" Wakefield, materials for the F. of," by Gissing, 



i860 (?), is. 6d. ; Van Voorst. York, " Plantre 



Eboracenses," by Robert Teesdale in Trans. Linn. 



Soc., 1792 (?), vol. ii. pp. 103 ; Supplement, 1798, 



vol. v. pp. 36. 



Eastern Borders. 



"Botany of the," by G. Johnston, 1853, 10s. 6d. ; 

 Van Voorst. 



Midland Counties. 



" Botanical description of Brit, plants of," in- 

 cluding fungi, 34 col. plates, by T. Purton, 2 vols., 

 l8l7» £l. Stratford-upon-Avon. "Appendix to 

 same with indexes," 2 vols., 1S21, £l lev. 

 London, both Longmans. 



WALES. 



Anglesea, Catalogues of plants of, in Latin, English, 

 and Welsh, with habitats of rarer species called 

 "Welsh Botanology," by Hugh Davies, 1813, 

 about 4f. 6d. London. 



Swansea (where British Association meets, 1880), 

 Material for a Fauna and Flora of, by L. W. 

 Dillwyn, 1821, about $s. Tenby, Contributions 

 towards catalogue of plants of, 121110., 2s. ; 



Longmans. 



SCOTLAND. 



" F. Scotica" (on Linnaean method with sketch of 

 Scotch zoology, by T. Pennant), with 37 plates, 

 by John Lightfoot, 2nd ed. 2 vols. 1792, jos. ; 

 "F. Scotica," by W. J. Hooker, 1S30, 14J. ; 

 Hurst, London. "Scotch Cryptogamic Flora," 

 by R. K. Greville, 6 vols, royal Svo. 19th, £S 8s. ; 

 Bohn. 



Aberdeenshire. 



Aberdeen (town), " F. Aberdonensis," by G. Dickie, 

 1838, 2s. 6d. ; Whittaker. 



Edinburgh (city). 



"Catalogue of Phanerogamic plants of," by James 

 Woodforde, 1824. " F. Edinensis," by R. K. 

 Greville, 1S24, 16s. ; Cadell. "F. of," by 

 Professor J. H. Balfour, with map, 1875, y. 6d. ; 

 A. & C. Black. 



Forfarshire. 



"Plants of," by Don, F.L.S., before 1830. " F. 

 of," by W. Gardiner, 19th, Js. 6d. ; Longmans. 



Lanarkshire. 

 " Description of plants of," and glossary, by Patrick, 

 before 1831, 6s. ; Simpkin. Glasgow, " F. 

 Glottiana," by Thomas Hopkirk, 1813, p. 6d. ; 

 Longmans. 



Shetland Islands. 



" F. of," by Thos. Edmondston, 19th, 2s. 6tl. ; 

 Whittaker. 



IRELAND. 



" Planta; Rariores in Hibernia invents," by Walter 

 Wade, 1804. Dublin. " Catalogue of indigenous 

 plants of I.," by J. T. Mackay, before 1830. " F. 

 Hibernica," by the same, i6j. ; Longmans. " Irish 

 F." (anon.) 121110., 5.C ; Longmans. " Cybele 

 Hibernica," by Moore & More, 10s. 6</. ; Van 

 Voorst. 



Cork. 



" Contributions towards a Fauna and F. of County," 

 19th, 3J. 6d. ; Van Voorst. 



Dublin (county). 



" Catalogus Systematicus Plantarum Indigenarum in 

 Comitatu Dubliniensi inventarum," by Walter 

 Wade, 1794. Dublin. 



THE FRESHWATER SPONGE. 



IN January, 1879, my attention was drawn to a 

 piece of freshwater sponge (Spongilla fiuvia tills) 

 growing in one of my glass vases. I remembered that at 

 the end of 1877 I had placed a small portion of sponge 

 in the vase, when it attached itself to a stone at the 

 bottom, where it continued to grow for some time, and 

 perfected the ovaries. It then died, and the ovaries 

 were left in the vase. I did not in the least expect to 

 see any growth from them, and was agreeably sur- 

 prised to find that some of them had sprung into life. 

 When first observed, the piece of sponge was about 

 the size of a pea and was attached to a weed. This 

 I fastened to the top of the glass, so as to bring the 

 sponge near to the surface of the water, and so as to 

 enable me to examine it with a pocket lens and 

 watch its further growth. Thus it continued to grow 

 and increase in size. I was enabled to see the incurrent 

 enter into the pores, carrying small particles of 

 floating matter with it on which the sponge feeds. 

 The excurrent also through the oscula was most 

 interesting, for, having fixed the sponge within half 

 an inch of the surface of the water, the current dis- 

 charged through the oscula, carrying with it the effete 

 matter, was of sufficient force to cause an eddy, or 

 vortex in the water, two inches in diameter, carrying 

 with it the lighter weeds, such as duckweed, and 

 small detached pieces of other weeds floating at the 

 top. This current at times becomes slow, and ap- 

 pears as though the creature rested for a season ; and 



B 2 



