20 A TREATISE ON" THE CONNECTION OF 



heat. This is capable, by certain processes, of being 

 disengaged from those bodies, and of becoming manifest 

 to the senses, or of passing and entering into a state of 

 combination with other bodies. 



The frequent changes in the degree of heat and ccld 

 in the atmosphere, are to be ascribed more to the alter- 

 nate disengagement and fixation of heat, by chemical 

 combination, than to the effects of the solar rays. 



SALINE SUBSTANCES 



Are compounds, consisting of different combinations 

 and proportions of earth, gasses, water, and the prin- 

 ciple of heat ; to which must be added (although not yet 

 treated of) the results of more compounded substances, 

 such as animal and vegetable matter. 



Saline substances consist of acids, alkalis, and neutral 

 salts, resulting from the combination of acids with earths 

 and alkalis. These arc stated hereafter in separate tables, 

 wherein their uses and properties, as applicable to agri- 

 culture, are more fully explained. 



VEGETA- 



