94 THE SOIL SOLUTION 



a. Aspartic acid has been found in young sugar-cane and in seedlings 

 of the bean and pumpkin. 



b. Asparagine was first found in asparagus ; but has since been shown 

 to be relatively abundant in many species. 



c. Glycocoll is one of the simpler and more common degradation 

 products of proteins. 



d. Alanine is a common degradation product of proteins and is related 

 chemically to phenylalanine, and to tyrosine, which has been found in 

 many plants. 



e. Leucine, an amino-acid of a paraffine series and a decomposition 

 product of proteids, has been found in certain mushrooms, vetches, lupine, 

 gourds, potatoes, corn, etc. 



/. Tyrosine is an important decomposition product of proteids, is 

 widely distributed and found in many plants and fungi. 



g. Choline is a derivative of certain lecithins and is found in many 

 seeds and growing plants. 



h. Neurine is a substance closely related to choline, and probably 

 formed from it. 



i. Betaine is closely related to both choline and neurine, and is found 

 in many seeds and plants. 



j. Alloxan is closely related chemically to convicine, which latter is 

 found in beets and certain beans. 



k. Guanine is a widely distributed nitrogenous body, and has been 

 found in the seeds of vetch, alfalfa, clover, gourds, barley, sugar-beets 

 and sugar-cane. 



/. Xanthine, a substance closely related to guanine, has been found in 

 a number of plants. 



m. Guanidine, a substance chemically related to guanine, has been 

 found in a number of plants of different species. 



n. Skatol is a derivative of proteids and is a common product of the 

 activities of some varieties of bacteria. 



o. Pyridine has been shown to exist in soils, as such probably, by 

 Shorey, who obtained it from certain soils in Hawaii. 



p. Ricin is found in the castor-oil plant. 



q. Mucin has been found in yams. 



r. Pyrocatechin has been found in the bark of various trees, the 

 berries of the Virginia creeper, the sap of sugar beets and in several 

 varieties of willows. 



s. Arbutin has been found in many plants, especially in some of the 

 grasses. 



t. Phloroglucin is easily derived from a number of plant constituents. 



u. Vanillin forms readily from a glucoside, which is very widely dis- 

 tributed in many plants, and by some authorities is supposed to be a 

 product of the decomposition of wood tissues. 



