. The natural history of the farm; a guide to the practical study of the sources of our living in wild nature. Natural history. 36 HISTORY OF FARM ? mud at the bottom, that stand erect and emer- gent with their tops above the water. A Fig. 15. Floating plants: o, duckweeds; and feW of the more Strik- ing and characteristic are shown m i^'igitre i6. Algae are common enough here also. Brown coatings of diatom ooze over- spread the submerged stems, and flocculent green mats of "blanket algae" lie in sheltered openings, often buoyed to the surface on bubbles of oxygen. 6, the floating li
. The natural history of the farm; a guide to the practical study of the sources of our living in wild nature. Natural history. 36 HISTORY OF FARM ? mud at the bottom, that stand erect and emer- gent with their tops above the water. A Fig. 15. Floating plants: o, duckweeds; and feW of the more Strik- ing and characteristic are shown m i^'igitre i6. Algae are common enough here also. Brown coatings of diatom ooze over- spread the submerged stems, and flocculent green mats of "blanket algae" lie in sheltered openings, often buoyed to the surface on bubbles of oxygen. 6, the floating liverwort (Ricciocarpus natans) of these are shown in Figure THE ANIMAL LIFE OF THE STREAM The animals that live in the rapids are small in size, but most interesting in the adaptations by means of which they are enabled to withstand the on-rush of the waters. One of them at least, the black-fly larva, occurs in such numbers as to form conspicuous black patches in most exposed places— on the very edge of the stones that form the brink of waterfalls and on the sides of obstructions in the current. Individually these larvae are small (half an inch long), with bag-shaped bodies, swollen toward the rear end, where attached by a single sucking disc to the supporting surface. Attached in thousands side by side, they often thickly cover and blacken several square feet of surface. They sway gently in the current as they hang with heads down stream. These larvae spin at- tachment threads by p.^. le. Aquatics that rise from standing means of which theymay rtt"s^ee?laTw?^*l'"^nS: change location. The tafu^Z/toTw^.-or"''"''*""''^""^''• *^''^'". Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Needham, James G. (James George), 1868-1956. Ithaca, N. Y. , The Comstock Pub
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
