St Nicholas [serial] . THREE BREATHING OPENINGS (SPIRACLES) ON THE SIDEOF THE BODY OF A CRICKET. (MAGNIFIED.) and with certain insects can practically be closedagainst the entrance of water. Of course there A MAGNIFIED VIEW OF THE SPIRACLE OF A SILKWORM. do, by means of gills, but with this difference,that the blood of fishes flows through the gills,whereas with water-insects the air circulatesthrough the gills and is purified by the entranceof oxygen from the water through the delicatemembrane of the gill. —Dr. Leland O. Howard. DO FEATHERS BECOME WHITE WITH AGE ? New York City, N. St.
St Nicholas [serial] . THREE BREATHING OPENINGS (SPIRACLES) ON THE SIDEOF THE BODY OF A CRICKET. (MAGNIFIED.) and with certain insects can practically be closedagainst the entrance of water. Of course there A MAGNIFIED VIEW OF THE SPIRACLE OF A SILKWORM. do, by means of gills, but with this difference,that the blood of fishes flows through the gills,whereas with water-insects the air circulatesthrough the gills and is purified by the entranceof oxygen from the water through the delicatemembrane of the gill. —Dr. Leland O. Howard. DO FEATHERS BECOME WHITE WITH AGE ? New York City, N. St. Nicholas: Do birds get white feathers whenthey grow old ? My bird is eight years old, and this yearwhen he molted he got two white feathers on top of hishead. He never had them there before, and I wonderedif he was growing old or not. With love fromHope Satterthwaite (age 10). The occurrence of white feathers in a birdsplumage is very common. It is, of course, dueto lack of coloring-matter, and is liable to appearin
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Keywords: ., bookcentury1800, bookdecade1870, bookidstnicholasserial371dodg
