223 APPENDIX. 



The following experiments were instituted in pure sand, and in the 

 artificial soil : — 



VICIA SATIVA. 



a. — In Pure Sand. 

 The vetches attained by the 4th of July a height of ten inches, and 

 seemed disposed to put out blossoms. On the 6th of the same month, 

 the blossoms unfolded; and on the 11th they formed small pods, which, 

 however, did not contain seeds, and withered away by the 15th. Simi- 

 lar plants, which had already begun to have yellow leaves below, were 

 drawn with their roots out of the sand, the roots washed with distilled 

 water, and then dried and incinerated. 



b. — In Artificial Soil. 

 The plants reached the height of eighteen inches by the middle of 

 June, so that it became necessary to support them wilh sticks ; they 

 blossomed luxuriantly on the 16th of June ; and about the 26th put out 

 many healthy pods, which contained on the 8th of August ripe seeds, 

 capable of germinating. Similar plants to the above were taken with 

 their roots from the soil ; they were then washed and incinerated. 



HORDEUM VULGARE. 

 a. — In Pure Sand. 

 The barley reached on the 25th of June, when it blossomed imperfectly, 

 a height of 1? foot, but it did not produce seed ; and, in the month of 

 July, the points of the leaves became yellow ; on which account, on the 

 1st of August, we removed the plants from the soil, and treated them as 

 before. 



B. — In Artificial Soil. 



The barley, by the 25th of June, had reached a height of 2i feet, by 

 which time it had blossomed perfectly ; and yielded, on the 1 Oth of 

 August, ripe and perfect seeds ; upon which the plants, together with 

 their roots, were taken from the soil, and trea-ted as formerly. 



A VENA SATIVA. 

 a. — In Pure Sand. 

 The oats, on the 30th of June, were li foot in height, but had blos- 

 somed very imperfectly ; they did not produce fruit ; and, in the course 

 of July, the points of their leaves became yellow, as in the case of the 

 barley ; on which account the stalks were removed from the soil on the 

 1st of August, and treated as formerly. 



B. — In Artificial Soil. 

 The oats reached 2£ feet on the 28th of June, having blossomed per- 



