The germination net consists of ordinary mosquito netting, 

 thoroughly paraffined by dipping in melted "Parawax" (or other 

 paraffin of equally high melting point) . The net is to be tied 

 as tightly as possible over the top of the germination jar. A 

 new net should be used for each germination. 



The germination jar is an ordinary 5-gallon stoneware jar, 

 approximately 28 cm, in inside diameter and 34 cm. high, glazed 

 inside and out. The germination net should be tied tightly over 

 the opening of the jar, so that when the jar is filled with solution 

 the water surface practically coincides with the plane of the net. 



Insert in the jar a vertical glass tube, which will lie close to 

 the jar wall and project a few centimeters above the net, through 

 which it passes. This tube should be broken obliquely at its 

 lower end, where it rests on bottom of jar. The upper end should 

 be cut squarely off. The bore of the tube should be about a cen- 

 timeter, or more. New solution is added through this tube, so 

 as to be introduced at bottom of jar. 



From a suitable support above, a glass thermometer is to be 

 suspended vertically, so that its bulb lies just entirely below the 

 net, extending through the latter at its center. This shows the 

 temperature of the solution that lies about the seeds. 



It is aimed to maintain the temperature for germination 

 within about 2° C, and it will therefore be necessary generally 

 to place the whole jar in a larger water-bath, to which cold or 

 warm water may be added two or three times a day, according 

 to the needs of the temperature control. A better form of con- 

 trol may of course be used ; this method "by hand" is taken as 

 the simplest and least expensive. An ordinary galvanized iron, 

 wooden or fiber wash-tub is suitable for the bath in which the 

 germination jar stands. The bath water should not reach as 

 high as the edge of the netting where the latter projects over 

 the edge of the jar. 



The apparatus should stand in a lighted place, subject to the 

 ordinary fluctuation of day and night, free from poison gases and 

 laboratory fumes, but should not receive- direct sunshine at any 

 time. It should be so placed that the overflow will be drained 

 away. Ordinary water is used for the bath; nutrient solution 

 for the jar. Solution is added to the jar once a day during 

 germination, and water is added to the bath as frequently as may 

 be necessary to obtain the needed temperature control. In both 

 cases there will of course be an overflow, the water solution from 

 the jar rising through the net and passing over into the tub. 



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