196 THE NORTHERN MICROSCOPIST. 
Cyclops quadricornis. 
Vaulter. 
Tubifex rivulorum—(Red Summer Worm). 
Dytiscus marginalis 
Gyrinus natator. 
Paramecium aurelia. 
Brown Luglena viridis. 
Green ditto. 
Vorticella microstonia, 
Euplotes patella. 
Ameaba princeps. 
Actinophrys sol. 
Brachionus pala. 
Rotifer vulgaris. 
Pinnularia gigas, 
Ditto major. 
Navicula rhomboides. 
Gomphonema elongatum. 
Closterium lunula, 
NOTES AND QUERIES. 
Ponp Scoor.—A scoop is often required for scraping the sur- 
face of the mud at the bottom of shallow pools, when searching 
for Oscillatoria, and other algze. A convenient form may be seen 
in fig. 35. It is simply a ring of tin, five inches in diameter and 
eee 
US 
Fig. 35. 
one inch deep. Both edges are wired, as the tinsmiths call it, and 
a ferrule is soldered to the side, so that it may be attached to a 
stick. Over the bottom is stretched a piece of thin muslin, which 
is tied over the wire ring, or coarse gauze may be used instead.— 
Phin. 
STRASSBURGER’s Moist CHAMBER.—This consists of an ordinary 
slide upon which is placed a square or circular cell of porous card- 
board soaked in water. The object for observation is placed upon 
a thin cover in a drop of water, and the whole is reversed upon the 
cardboard cell. By means of this simple device, Prof. Strassburger 
has been able to preserve for many days Spirogyra in conjugation. 
By moistening the cardboard cell from time to time the moist 
atmosphere can be easily maintained.—/. de Phot. et de Micr. 
