68 DESCRIPTION OF A IIIIEUMAMETER. 



«nd then, occasioned in consequence of the bursting, I tma* 

 gine, of the glands of new flowers; which, from their not 

 being before developed, remained uninjured, during former 

 experiments. 

 The glands de- Qn examining the plants after the combustion, 1 ob« 

 these experi- served, that the glands wers completely destroyed; and thui 

 ments. I was led to suppose, that the resinous fluid which they con- 



tained was burnt during the explosion; and not that hidro- 

 gen, or any inflammable vapour was exhaled. Since after- 

 trtd no smell experiments never sucreeded so well as the first; and 

 «Tcrper«:h'ed. ^^'3^^*-' ^^^^ smell of hidroj^en was never present, either 

 before or after the experiment, 1 tljiuk I am stretigthened 

 in my opinion. At the same time, however, I confess, that 

 I am not completely satisfied with my own observations, 

 and therefore wish that some one, who has convenience, 

 would not only repeat the experiments, but communicate 

 the result of them to the public, and thus either ascertain 

 the truth of what I have reported, or annul it altogether. 



XI. 



jOescr'ption and Use of a Uheumameter, to estimate and 

 compare the Velocity of the Current of Rivers ; bi/ Mr. 

 Regnier, Conservator of the central Musetiin of ArtiU 

 levy *. 



©ifFcrcnt jj^ ROM Mariotte to the present day men of the first emi- 



uieans em« i^ei^ce have employed different means to estimate the velo- 

 ployed to mea- « 



sure the velo- city and force of rivers; and their methods, more or less 

 city of rivers, ii^genious, seem to leave nothinsj to be desired. 1 may incur 

 the imputation of temerity therefore in bringing forward 

 another, perhaps not equally good ; but as it is very sim- 

 ple, attended with little expense, and requires no calcula- 

 tion, it may suit a great many persons, who are desirous of 

 erecting mills or other works on rivers, with the velocity of 

 which they are unacquainted. 

 Bynamometer lyj^^ Gauthey, inspector general of bridaes and highways, 

 applied to this ' ' . =* r • «u i r 



purpose, first employed my sprmg powderproof m the shape ot a 



• Abridged from Sonn'mi's Biblioth. Physico-ccon. March, 1810, p. 193. 



steelyard. 



