26 Prof. Bailey on the Crystals found in Plants. 



But as the complete identity in crystalline form of the crystals 

 in all the plants contained in table A, appeared fully established, 

 it follows that unless several isomorphons bodies occur thus crys- 

 tallized in these plants, the composition must, like the form, be 

 identical in all. This conclusion was confirmed by numerous 

 micro-chemical experiments on the crystals in cherry, poplar, oak, 

 chestnut, &c., and. no result at variance with this view was in any 

 case obtained. 



The mention by several authors of crystals of phosphate of 

 lime being found in plants, made me search for it frequently, but 

 the invariable result of the experiments on all the crystals of form 

 A was, that when carefully isolated, and then ignited, they left a 

 carbonate insoluble in water and effervescing with acids, show- 

 ing decidedly that they contain no mineral acid. 



I pass now to the examination of the crystals which resemble in 

 form those found in hickory, and which I shall refer to as form 

 B. (See figures 1, 2, 10, and 11.) These forms are far less 

 abundant in dicotyledonovs plants than the preceding. All the 

 species in which 1 have detected them are given in the follow- 

 ing list. 



Table B. 



Dicotyledonous plants containing crystals of form B. (Figs. 1, 2, 3, 



4, 10, and 11.) 



CoNACE^, Pinus strobus. In the bark sparingly. 



Abies Canadensis. 



Ericaceae, Kalmia lalifolia. 



Fkankeniace^^;, Frankenia Isevis. 



JuglandacejE, Carya, every species exaniined. Form B predomi- 

 nates, but bunches occur also abundantly. (See 

 figs. 1, 2, 10, and 11.) 



PoLYGALACEiE, Krameria, (radix.) 



Rosace.^, § Quillaja;, Quillaja saponaria. The bark is crowded with 

 crystals of form B, fig. 10. 

 Among monocotyledonous plants, this form is found abundantly in 



the Iridacese, as Iris, Crocus, Gladiolus, &c. 



On comparing the crystals occurring in the different plants con- 

 tained in table B, such close relations of form were seen to exist, 

 that no doubt was left that they were all modifications of the 

 same primary. Thus we find that in all these forms, the lateral 

 planes are at right angles ; which fact has caused them to be 



