NOTES. 141 



because of its hardness. 4. 1st ... dass gefunden . . . kann, ist sufficiently 

 perfect to be found. 5. in ... Plachen, into several triangular and quad- 

 rangular surfaces to be produced by grinding. 6. wie . . . unterhalb an- 

 gebracht . . . sollen, according as they are to be applied above or below. 



XXVI. DER BERNSTEIN. 



i. vorgeschichtlicher Zeit, prehistoric time. 2. wie gering. .., 

 however small the amount of salt which may be in the water of the Baltic. 3. 

 der . . . , which furnishes a resin quite similar to the amber. 4. iibergiebt, 

 yields. 



XXVII. DIE ZURUCKWERFUNG DES SCHALLES. 



i. leite man, let one conduct. 2. betragt, amounts to. 3. so ... 

 zurlick, the sound going to and fro passes over a distance of two times eighteen 

 or thirty six feet. 4. bewirken . . . , produce in this manner an increase of 

 sound. 5. aua Blech gearbeitete, made of tin two to three centimeters 

 thick. 



XXVIII. DAS IN DER NATUR VORKOMMENDE WASSER. 



I. schwebend . . . , are held in suspension. 2. Regenhohe, rain-fall. 

 3. undurchlassig, impenetrable. 4. Dem Geschmacke nach . .. Ac- 

 cording to taste, the mineral waters are called. 5. dieselben werden 

 ermittelt, these are ascertained. 



XXIX. DER VERBRENNUNGSPROCESS. 



i. wird . . . , heat is set free. 2. zum Teil, partly. 3. erst . . . , not 

 until. 4. bereits vorher ausserhalb, previously outside of. 5. nimmt 



nicht Teil, takes no part. 6. ist . . . , see Introduction, 2. 7. findet 



plotzlich statt, there takes place suddenly. 



XXX. BUTTERSAURE. 



i. dauernden . . ., lasting grease-spot. 2. der dem der gleicht, 

 which resembles that of. 3. lost . . ., it is still harder to dissolve. 4. die ... 

 Alkalieu, those alkaline salts of less specific gravity. 5. zeigen das 

 recht . . . , show the very striking characteristic. 



