1883.] 



MICROSCOPICAL JOURNAL. 



63 



noticed in bottled pond-water, and I 

 suppose ultimatelv nearly all the 

 smaller beings will be exterminated by 

 Daphnia, Cyclops, or naiadine worms, 

 and most of the larger ones by simple 

 starvation. But up to this time many 

 forms have been noticeably constant ; 

 for instance, less than twelve hours 

 after the water was taken from under 

 the ice, I found in it the largest and 

 most magnificent floscules I have ever 

 seen, also very large and fine tardi- 

 grades. These same creatures are as 

 large now, and perhaps nearly as 

 abundant, as ever, but have a more or 

 less pale, shrivelled and sickly appear- 

 ance. 



I append a list of the organisms 

 which I have observed in this single 

 ounce of winter pond-water as far as I 

 have been able to identify them by 

 the aid of the books at my command, 

 but I confess that the catalogue is 

 very incomplete for many creatures 

 that I saw could not be reconciled 

 with any figure or description given 

 by Pritchard or Kent. 



Among the algae were many varieties 

 of Spirogyra and Oscillatoria, Ruphi- 

 diutn polymorphum^ Protococcus, Chro- 

 ococcus rjfracfiis, the desmids Scenedes- 

 mus quadricaiida, Closterimn acerosum, 

 rostratum and Ehre/ibfrgii, Micrastcrias 

 Americana and Furcata. 



The rhizopods \x\<z\\x(\.tdi Amxba pro- 

 teus, Difflugia pyriformis, many varie- 

 ties, acuminata, globulosa and corona, 

 Arcella vulgaris and artocrea, Centro- 

 pyxis aculeata, Euglypha ciliata, Actino- 

 phrys sol, Actinosphceriutn Eichhornii, 

 Acanthocystis chatophora, Clathrulina 

 elegans. 



The diatoms included Diatoma vul- 

 gare, and two or more species of 

 Tab:llaria, Cocconeis, Navicula, Pinnu- 

 laria, Stauromis, and Gotnphotiema. 



Among the infusoria were — Trache- 

 locera olor, Kerona polyporum, Vaginicola 

 crystallina, Vorticella microstoma and 

 campanula, Epistylis nutans, Mcgalo- 

 trocha albo-flavicans, Microcodon clavis, 

 Notommata tigris, SyiuhcBta pectinata, 

 Monocerca bicornis, Mastigocerca cari- 

 nata, Rotifer vulgaris, Philodina roseola, 



Distemma forficula, Stentor polymor- 

 p/ius, Tardigrada sp., Dinocharis pocil- 

 lufn, Limnias ccratophylli, Colcps hirtus, 

 Mctopidia acuviinata, Lcpadclla, C/ice- 

 tonotus lams, Trachclius anas, Floscula- 

 ria ornata, cornuta and trifolinm (^.), 

 Anguillula pluviatilis, Euglcna viridis, 

 pljuronjctes, and deses, Cyclops quadri- 

 cornis, Daphnia sp., Nais (several 

 worms of this tribe). The, water also 

 contained a great variety of smaller 

 infusorians. 



The collector of the water above 

 mentioned has since informed me that 

 it was obtained on January 25th from 

 the bottom of a small pond having 

 neither outlet nor inlet (but possibly 

 supplied by a spring), which lies in a 

 depression in an old pasture. This 

 little pond is not more than eighteen 

 feet in diameter, and then contained 

 from 4 to 6 feet of water covered by 

 ice 10 inches thick upon which lay 3 

 feet of snow. J. C. S. 



Bangor, Maine, Feb. 29th, 1883. 



A New Lamp-Shade. 



Mr. Wm. J. Morrison has sent us 

 a description of a forni of lamp shade 

 applicable to a student-lamp, with 

 photographic illustrations. Instead of 

 the ordinary porcelain shade, a similar, 

 conical shade of tin is provided, having 

 a cylinder extending nearly to the 

 top of the chimney. A similar conical 

 shade (without any chimney however), 

 extends downward from the shade- 

 ring, so that the light is entirely con- 

 fined by the two cones — except 

 what reaches the ceiling from the 

 chimney. The lower cone has an 

 opening of suitable shape and size to 

 allow the light to be directed upon 

 the mirror. 



We have seen, at Mr. Woolman's 

 store, an excellent shade for a com- 

 mon hand-lamp. It consists of a 

 black metal cone fitting over the 

 chimney, with an opening cut near 

 the bottom for the light to pass through 

 to the mirror. The cone simply hooks 

 over the top of the chimney. 



