DESCRIPTIVE NOMENCLATURE. 277 



Proserpina. I delay any extended description of 

 these until we have examined the structure of 

 wood itself more closely; this intricate and 

 difficult task having been remitted (p. 195) to 

 the days of coming spring; and I am well pleased 

 that my younger readers should at first be vexed 

 with no more names to be learned than those of 

 the vegetable productions with which they are 

 most pleasantly acquainted : but for older ones, I 

 think it well, before closing the present volume, 

 to indicate, with warning, some of the obscurities, 

 and probable fallacies, with which this vanity of 

 science encumbers the chemistry, no less than the 

 morphology, of plants. 



Looking back to one of the first books in which 

 our new knowledge of organic chemistry began to 

 be displayed, thirty years ago, I find that even at 

 that period the organic elements which the cuisine 

 of the laboratory had already detected in simple 

 Indigo, were the following: — 



Isatine, Chlorindine, 



Bromisatine, Chlorindoptene, 



Bibromisatine ; Chlorindatmit ; 



Chlorisatine, Chloranile, 



Bichlorisatine ; Chloranilam, and, 



Chlorisatyde, Chloranilammon. 



Bichlorisatyde ; 



