nTater in almojl every Situation. 48} 



die furface afe not of a good quality, this is the beft method of proceeding In fearch 

 of better at a great depth, as Cit. Dufour has done in the well which forms the fubjefil 

 of the prefent obfervation. 



After the well in queftion had been emptied, C. Dufour bored the bottom, and placed a 

 pipe of ten feet in the hole. This depth was fufficient to pafs through the bed of mephi- 

 tized earth, and reach the lower body of water, which being thus infulatpd by the cylinder, 

 rifes pure into the body of the pump, which is fixed for that purpofc. 



I have thought it ufeful to give publicity to this laft procefs, more efpecially with regard 

 to Paris, where the neceflaries and drains have fucceflively infefted the ground by their 

 bad conftru£lion, and rendered a great number of wells ufelefs. This method appears to 

 be the only one capable of remedying this inconvenience, and reftoring the utility of thefe 

 abandoned wells. 



I fliould reproach myfelf for not entering into a longer detail refpefting thefe artefian 

 wells and fountains, on account of the preference they deferve over our ordinary wells, by 

 the advantages they prefent. But knowing that my colleague C. Gillet Caumont pofleffes 

 very interefting fadls refpe£ting them, I have invited him, and he has promifed the Society 

 to extract from a work undertaken on this obje£V, whatever may relate to its rural and 

 oeconomical ufes, and to publifli it *. 



II. 



Memoir on fevered newly difcovered Properties of phofphorated Hydrogen Gas. By 

 Citizen Raymond, Profejfor of Chemijlry at the Central School of the Department of 

 the Ardeche, 



(Concluded from Page 475.^ 



X^ ROM the quantity of water and gas which I had at firfl: attempted to diflolve, as well 

 as from the explofions which took place the inftant the bottle was unllopped, I was certain 

 that the diftilled water could not, at a temperature of twelve degrees, diflolve an equal 

 volume of phofphorated hydrogen gas. In the fecond experiment, therefore, I had tlic 

 precaution to fill the decanter only one third with the above gas ; after which I (hook the 

 mixture feveral times, in order to facilitate the combination -of the gas with the water, and 



• It is at prefent a common pr.a£lice in London, fince the general introduflicn of the fteam engine into 

 private manufaftories, to fink a well, below the ftratura containing the furface water, into a quickfand, where 

 plenty of foft water is met with. The artefian procefs undoubtedly deferve s to be better known from its 

 fimplicit)', cheapnefj, and other good qualities. Dr. Darwin has defcribed a fomewhat fimilar operation ii\ 

 the Philof. Trauf. Vol. LXXV. i, and in the fame work. Vol. LXXIV. may be feen the Account of the 

 King's Wells at Harwich, by Tho. Hyde Page, Efq. and Mr, VuUiamy's overflowing well, in onr 

 Journal II. 176.— N, 



3 Qj! »t 



