Chap. XVI. MR. WARRINGTON'S REMARKS. 281 



It will be remarked, therefore, with reference to 

 the leaves which are to be converted into black tea, — 

 1st, that they are allowed to lie for some time spread 

 out in the factory after being gathered and before 

 they are roasted ; 2nd, that they are tossed about 

 until they become soft and flaccid, and then left in 

 heaps, and that this also is done before they are 

 roasted ; 3rd, that after being roasted for a few 

 minutes and rolled, they are exposed for some hours 

 to the air in a soft and moist state ; and 4th, that 

 they are at last dried slowly over charcoal fires. 

 The differences in the manufacture of black and green 

 teas are therefore most marked, and I think fully 

 account for the difference in colour, as well as for the 

 effect produced on some constitutions by green tea, 

 such as nervous irritability, sleeplessness, &c. This 

 is shown in some observations made by Mr. War- 

 rington, of Apothecaries' Hall, in his paper which I 

 have already quoted. 



"The question presents itself, then," says Mr. 

 Warrington, alluding to the variation of physical and 

 chemical properties in green and black teas, "from 

 whence do these distinguishing peculiarities arise, and 

 to what are they to be attributed ? From observa- 

 tions made in other directions, in the course of the 

 routine work of the establishment to which I am 

 attached, I had formed in my own mind certain con- 

 clusions on this subject. I allude to the exsiccation 

 of medicinal herbs ; these are for the most part nitro- 

 genous plants, as the Atropa belladonna, the Hyos- 

 cyamus niger, the Conium maculatum, and others. 



