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Página 68
In these books may be found illustrations of the various animalculæ , vegetable spores , & c . , likely to be present in water . Any grains of sand or mineral matter may be disregarded , as they will settle harmlessly ...
In these books may be found illustrations of the various animalculæ , vegetable spores , & c . , likely to be present in water . Any grains of sand or mineral matter may be disregarded , as they will settle harmlessly ...
Página 70
If the water should suffer from the presence of organic matter , we have a method of burning it away without even warming the water . If we add permanganate of potash , which contains a large percentage of oxygen , the combustible ...
If the water should suffer from the presence of organic matter , we have a method of burning it away without even warming the water . If we add permanganate of potash , which contains a large percentage of oxygen , the combustible ...
Página 72
These filters could not be expected to eliminate a foul gas or any other noxious matter dissolved in the water as a carbon filter would , because they have no power of absorbing oxygen gas from the atmosphere as carbon has , but they ...
These filters could not be expected to eliminate a foul gas or any other noxious matter dissolved in the water as a carbon filter would , because they have no power of absorbing oxygen gas from the atmosphere as carbon has , but they ...
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Abducted by Albatrosses By ECHLIN MOLYNEUX | 1 |
Are Proofs of the Descent of Man being Strengthened | 43 |
i | 51 |
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