. Foundations of botany. pirogyrn, one of the plants commonly knownas pond-scum, or frog-spit, occurs widely distributed throughoutthe country in ponds, springs,and clear streams. It is of - agreen or yellowish-green color,and in sunny weather usuallyfloats on or near the surface ofthe water, buoyed up by thenumerous oxygen bubbles whichit sets free. It may be foundflourishiDg in unfrozen springs,even in midwinter. 274. Examination with theMagnifying Glass.^ — Float alittle of the material in a whiteplate, using just water enoughto cover the bottom of the with the magnifying glass
. Foundations of botany. pirogyrn, one of the plants commonly knownas pond-scum, or frog-spit, occurs widely distributed throughoutthe country in ponds, springs,and clear streams. It is of - agreen or yellowish-green color,and in sunny weather usuallyfloats on or near the surface ofthe water, buoyed up by thenumerous oxygen bubbles whichit sets free. It may be foundflourishiDg in unfrozen springs,even in midwinter. 274. Examination with theMagnifying Glass.^ — Float alittle of the material in a whiteplate, using just water enoughto cover the bottom of the with the magnifying glassand note the green color of thethreads and their great lengthas compared with their thick-ness. Are all the filaments aboutequal to each other in diameter ? Handle a mass of the material and describe how it feels betweenthe fingers. 275. Examination with the Microscope. — Mount in water undera large cover-glass and examine first with a power of about 100 1 Consult Huxleys Biology and Spaldings Introduction to Fig. 17G. —A Group of Diatoms. A, Achnanthes; B, Cocconema;C, Meridion; D, Pleurosigma. 242 FOUNDATIONS OF BOTANY
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1901
