136 On the Barometer. 



that used to saturate an equal weight of the same acid 

 diluted with water, and I find them to agree exactly. 



M.Vogel*, in his remarks on this suhject, seems to think 

 that increasing the quantity of acid hastened the forma- 

 tion of the sugar. He only obtained the syrup; time did 

 not permit him to go further : we are therefore, for the pre- 

 sent, deprived of that able chemist's remarks on this sub- 

 ject. Should my future experiments on this sui)ject prove 

 sufficiently interesting, I shall have great pleasure in mak- 

 ing them public, and I will take tlie liberty of asking; in- 

 dulgence for these, as I am but a pupil ui that science in 

 which there are at present so many able proficitnts. If these 

 remarks should induce some able investigator to pursue 

 the subject, and thereby benefit science and the arts, I shall 

 consider myself as very fortunate. 



XXVIl. 0/1 the Barometer. i?y Richard Walker, £5(7, 

 Oxjhrd. CutiDirunlcaled bij the A2Uh.or. 



To Mr. Tllloch. 



Sir, ohould the following observations, forming the 

 conclusion of a subject, viz. "Observations on the Baro- 

 meter," which you did me the favour to communicate, 

 through the channel of the Philosophical Magazine for 

 October 1810, and the two following numbers, be deemed 

 not unworthy of a place in your next number, I request 

 you will have the goodness to insert them. 



I am, sir, your obedient servant, 



Oxford, August 17, !81'.'. RlCHAKD WaLKER. 



P. S. — I have judged it expedient, in the course of these 

 observations, to descend occasionally to particulars which, 

 to the generality of your readers, must be totally unneces- 

 sary, but which to some persons, who may not before 

 Lave given much attention to this subject, may not prove 

 unacceptable. 



The reason of the long interval between this and my 

 former communicalions on the same subject, is in conse- 

 quence of mv aliention havinij; been engaged in a small 

 work of a diflcrent nature, which 1 hope soon to have it 

 «u my power to announce. 



The barometer, statiovary, with a concave surface of the 

 mercury at the top, is an almost infallible indication of 



• Jdurnal de Pliysii/ue M^rs'}8\-^, Notice sur la traiismutstion de fecula 

 4t fqjment en matiere sucrce, par M. Vogel. 



rain. 



