| Massachusetts - 1875 - 692 頁
...indicated in, the meteorological observations, kindly furnished by Prof. ES Snell, LL.D., of Amhcrst College, will convince the inquirer that there is...seem to do so in the spring from a cause entirely different from that which affects the trees Avhich bleed in fall and winter. The grape, which is often... | |
| Sir Norman Lockyer - 1875 - 606 頁
...amount of their flowing. A paper-birch, fifteen inches in diameter, bled in less than two months over one thousand four hundred and eighty-six pounds of sap ; the maximum flow, on the 5th of May, amounting to sixtythree pounds and four ounces. The grape bleeds comparatively little as... | |
| State Pomological Society of Michigan - 1875 - 592 頁
...temperature as indicated in the meteorological observations, kindly furnished by Prof. ES Snell, LL. D., of Amherst College, will convince the inquirer that...seem to do so in the spring from a cause entirely different from that which affects the trees which bleed in fall and winter. The grape, which is often... | |
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