YOL. XVI.] PHILOSOPHICAL TBANSACTIONS. 315 



cations. Further, let there follow some words of several syllables, with the 

 accent variously placed, as on the first, second, third, &c. Let there be also 

 two or three small discourses written in this alphabet, in so many several lan- 

 guages, with the accent rightly placed, and truly distinguished by their pauses. 

 And thus you have a perfect primer. 



Of teaching with this Primer. — Begin with the true sound of all the vowels 

 singly; then proceed to the following single syllables, beginning with the easiest 

 of expression, and so on, gradually to the most difficult ; then to words of 

 more syllables ; and lastly, to the use of the accent and pauses. When the 

 learner has passed all these, he may be exercised in reading the discourses, and 

 therein let him exactly observe the accent and the pauses. When he can read 

 and utter exactly whatever is written in this character, in what language soever, 

 then teach him to write truly what he hears distinctly expressed, according to 

 this alphabet, proceeding therein gradually as before ; and observing rightly to 

 place the accent and pauses, and also the use of the signs of the different modes 

 of speaking. 



In teaching observe these necessary rules : — 1. Proceed leisurely and orderly. 

 Suffer not to pass by any mispronunciation uncorrected. 2. In spelling, let no 

 syllable be dismembered by repeating the letters singly, but pronounced whole 

 as they are found. This new primer will, without change, except in the title, 

 be the same for all nations and languages. 



Some further Remarks en the Instrument proposed by an anonymous French 

 Author, for effecting a perpetual Motion, an Account ivhereof is given in 

 N° 177 of these Transactions. By Dr. Papin, M.D. R.S.S. N° 182, 

 p. 183. 



Having seen in the Journal des Sqavans of May 13th, and in the Nouvelle» 

 de la Republique des Lettres of the month of June, that the author of the per- 

 petual motion is not satisfied, but endeavours to answer the objection that I 

 propounded against his contrivance, in the Philosophical Transactions of the 

 month of December, l685, I find I must explain myself more at large than I 

 did in that paper. 



I am fully enough convinced, that the mercury in his engine must follow the 

 laws of the equilibrium of fluid bodies : but the consequence which he draws 

 from that principle, seems to me very groundless ; for although the lowermost 

 part of the bellows be pressed by the weight of 40 inches of mercury, it does 

 not follow that all the parts which are situated higher must bare the same 

 pressure. On the contrary, it is plain that the upper part, having no mercury 

 above it, bears none at all ; the parts that lie in the middle, near the axes of 



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