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Prof. Bailey on the Crystals found in Plants. 



Salicaceje, Salix. 



every species of Willow 



Populus. Poplar examined by me, the crystals were 



in profusion, being distributed in cells, as 



shown in fig. 3, which was taken from 



Populus grandidenlata. 

 SantalacejE, Nyssa aquatica. 



ULMACEiE, Ulmus Americana. Crystals abundant in bark and 



leaves. 



Ulmus fulva. 

 Celtis occidentals. 



Quel 



VlTACEjE, 



;. 



nparia 



beautiful specimens of these crystals in situ, in the 

 testa of the seed of Ulmus. 

 Vitis vulpina. In the bark and veins of the leaves of 



the different species of this family, 

 occur rows of crystals, showing eve- 

 ry modification of form A. Acicular 

 raphides are also very abundant. 

 VAcciNACEiE, Vaccinium resinosum. Crystals resembling those of 



Diospyros, but smaller. 

 Urticace^e, Broussonetia papyrifera. 



Moras tinctoria, (fustic.) 

 Xanthoxylace^e, Xanthoxylum fraxineum. 



Ailanthus. Bunches also. 

 Zygophylleje, Guaiacum officinale, (lignum-vite.) Small crystals 



may be isolated by scraping, and may be seen abun- 

 dantly in the ashes. 



^ I have also seen in the monocotyledonous plant, Tradescantia Virgi- 

 nia, small crystals which I believe are referable to form A. 



The crystals found in the plants enumerated in the above table, 

 agree not only in general form, but the plane angles of the faces 

 P and M, were in many cases measured by the aid of a camera 

 lucida eye-piece, and found to correspond exactly with the meas- 

 urements above given ; (see figs. 5 and 7.) No doubt of the iden- 

 tity in composition of these crystals in the above mentioned 

 plants, can then be felt ; and hence instead of analyzing the crys- 

 tals in each plant, it is only necessary to examine carefully the 

 chemical composition in any one of them, in which the crystals 

 are particularly abundant or easily isolated. 



The following are the results of my experiments upon the 

 crystals in locust, {Robinia vseudacaciaA 



