BY MOLECULAR COALESCENCE. L] 
which they are the accurate representations, and there- 
fore I may at once proceed to consider the cause of these 
several appearances, and the manner in which this cause 
acts in producing them. Besides, these caleuli being 
easily prepared by followmg carefully the directions 
already given for their preparation, the various appear- 
Fig. 3. 
ances which they present in their several stages of forma- 
tion can be observed by any one who likes to prepare 
them on specimens of his own making. 
To show that the appearances presented by the carbo- 
nate of lime, as they are seen in the first experiment, 
fully justify the inference which has been deduced from 
