ON GRAVITATION. 2Q5 



Average of experiments produced — 



Carbonic acid gas* ........ .43'55 1 forming 97'50grs. 



Lime .53-().5 ^ carbonate of lime- 

 Oxides of manganese and iron *40 

 Water and loss 2'10 



1 00-00 



On adding to the filtered nitric solution of the second No alumine« 

 experiment succinate of ammonia, as a test for alumine, 

 no cloudiness ensued. 



Neither was any effect produced on the addition of prus* 

 siate of potash for iron. 



I had dissolved 200 grains of the thunder-pick in nitric 

 acid, in order to precipitate it, to say how far it would cor- 

 roberate the former statements, but being interrupted, I 

 unwarily added the alcali without previous filtering, and 

 afterwards a small portion of it ; however I proceeded in 

 collecting it, and the precipitate, after ignition, weighed 

 192'70 grains, which is certainly a nearer approximation 

 than I could have expected under the circumstances. 



XII. 



Remarks on a Review of Professor Vince\$ Essay on Gravi* 

 tation. In a Letter from the Author, 



To Mr. NICHOLSON. 

 SIR, 



JL Shall esteem it a favour if you will insert the following Remarks on 

 remarks upon the Edinburgh Review (vol. XXV) of my ^^^^^^'"o^f'';!^ 

 Essay on Gravitation. Essay on Gr*- 



The fl uxion of the elasticity from the change of distance ""t^tion. 

 X is no solution of the problem I proposed to answer, i. e. 

 " to iiud the effect of the fluid to impel a spherical body of 

 *' inhnite magnitude, towards the sun." The reviewer has 

 investigated a point, which has nothing to do with the pro- 

 posed inquiry; and so little was he acquainted with the 



Vol, XXI.— Dec. 1808* X subject 



