No. 129.] 8G7 



makes its way through his kidneys, and can be detected in his 

 urine. Cure him by sulphuric acid, or sulphuretted water, and 

 with the pain the lead disappears from his urine, but remains in 

 the system. Give him now a dose of iodide of potassium, and 

 the pains of poisoning return, and lead re-appears in his water. 

 A large dose will prostrate him with colic, but small doses, at 

 frequent intervals will gradually wash away the metal without 

 any sensible suffering. 



So mercury, after long protracted salivation, lingers likewise 

 long in the system, but the same chemical compound (iodide of 

 potassium) washes it effectually out. 



The precious color ultramarine, is now produced perfect and 

 abundantly, by chemical processes, from the refuse of certain 

 chemical manufactures. Chemistry analyzed ultramarine, and 

 found its components abundant, and equal to that always hither- 

 to obtained from the lapis lazuli at a great expense. 



Thus we find constant advancement in the practical benefits of 

 chemistry applied to the greatest of arts — agriculture, to almost 

 all works of art, and to great improvements in medicine. 



BEE. 



This wonderful little animal has always fixed the admiration 

 of the most observing and philosophic men in every age. Aris- 

 totle, who was well acquainted with much of the interesting 

 history of the bee, (about 2,200 years ago,) was the first to 

 observe that a bee, during each single excursion from the hive, 

 limits her visits to one species of flower. Modern naturalists have 

 confirmed the general accuracy of this statement, and noticed 

 that the pollen with which a bee comes home laden is always of 

 the same color. The necessity of this instinct arises out of the 

 operation which the pollen first undergoes when collected by the 

 bee. She rakes it out with incredible quickness, by means of 

 the first pair of legs ; then passes it to the middle pair, which 

 transfer it to the hind legs, by which it is wrought up into little 

 pellets. Now, if the pollen was taken indiscriuiinately from 

 different flowers, it is probable that the grains, being heteroge- 

 neous, would not cohere so effectually. Certain it is, that bees 



