. Elements of botany. Plants. 156 ELEMENTS OF BOTANY. a bell glass, with a wet cloth or sponge, to prevent evaporation of the syrup, and set aside in a warm place, or merely put some pollen in syrup in a watch crystal under the bell glass. Examine from time to time to note the appearance of the pollen tubes. Try several kinds of pollen if possible, using syrups of various strengths. The following kinds of pollen form tubes readily in syrups of the strengths indicated : Tulip 1 to 3 per cent. Narcissus 3 to 5 " Cytisus Canariensis (called Genista by florists) 15 " Chinese primrose ...

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. Elements of botany. Plants. 156 ELEMENTS OF BOTANY. a bell glass, with a wet cloth or sponge, to prevent evaporation of the syrup, and set aside in a warm place, or merely put some pollen in syrup in a watch crystal under the bell glass. Examine from time to time to note the appearance of the pollen tubes. Try several kinds of pollen if possible, using syrups of various strengths. The following kinds of pollen form tubes readily in syrups of the strengths indicated : Tulip 1 to 3 per cent. Narcissus 3 to 5 " Cytisus Canariensis (called Genista by florists) 15 " Chinese primrose ..... 10 " Sweet pea 1 • . 10 to 15 " Tropa3olum i ...... 15 ". 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Bergen, Joseph Y. (Joseph Young), 1851-1917. Bergen's Botany: key and flora, Pacific coast ed. Boston : Ginn

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1896