*1825;] Dr. Thomson's Answer fo Mr* Maini/. 355 



->iBi saw :A8fih edi fio7io0b=^hi^^7>o ^b^ oiiii sd^ aotlW 

 Bvom ^^ 40 396. , ^, ri„„^, ,,^ ^i^,.|l 4/356L, ^^.^j ^^,^^^ . 



t lifinommoo hap ,^q^'>R^ ibfft ^ifr/rr o^ ^'h.nin'^fton fioMw j^/^- 



«w ii'iiL^i©^^87;..'^/jj^P^gf.tiliai'i;^.-ii|j Il4^1»374748? no difim'ii 

 Ld§-80^^^ ''^lf«m^^ ge'f\ ,t^VS7^^hI ,r4771212iV if; o^ ion 



Bw miriMlxi') to '3bnoM'> '^jlt v.„;. ..,.,-« ^^ r/orfW 



erf flardw if lo Yt^f^^'^Ttro txifli i.c — 8'8976275i b^r^fj.jjj^^r, 



•roo Ji (fn.S' fO'SPiDy/T 0(fr to eloilw yn f{> flte^'fr- 



■° V D^.rfof'r^^/ 5nn" v'th bocf! / '^^dnt Vii'l 



.,-Ai^bsi(j(ji5gi M'^M^.^lftov.lil^jiqini- 3-8976275. r!t j^M 



• ''ftrfftiot aifo^narm fffi.; bf^Yolqms '£»T^rf- ]_ii^7Q3gg91 .^^jj ^j^ 



The number to which this logarithm corresponds is 0*6()80o695!j 

 = specific gravity of vapour at 37° (or extricated from weak 

 sulphuric acid of 49°). Thus the specific gravity calculated by <i 

 Mr. Rainy's own formula, instead of being higher than I made 

 it, turns out in fact rather lower. '"^[' ^^- ^ 



The difference between this and my former calculati8n^ Js^' 

 owing to some little alterations in the data. But these altera- ' 

 tions, for reasons to be immediately stated, I consider it as need- 

 less to discuss here. M 



Now the absolute weight of this vapour calculated by the . 

 obvioMiormula 0-00505695 x 137-08 x 0*305 is 0-21 143, grs, 



;T£og.0-0050569S-?^'T;J^^ 3-7038891 i^r ^rftl. 



^'^ Loi.l37-08;nJ^^^^^l^ :.. +2-1369741 ^^cJ .^SJfS: 

 ; u Lol 0-305 ^^^^^^■^'"-''' - 1-4843000 '* ♦'fr/n j .ji 



ft 110 yie«^^r>^fT pp^f>^'»T -'-r __ 1.3251632 "nr'J 



The number f corresponding to this logarithm is 0-21143. Tl^ia . 

 is about Tw^^^ ^^ ^ grain less than I estimated it. ^ Mu v/' 



These details have been both tedious and minute ; biit they ' 

 were necessary to satisfy Mr. Rainy that my conclusions are notr 

 liable to the objections which he supposes. i 



If we subtract the 0-163 grain of moisture retained by t^e 

 chloride of calcium from 0*21143 gr. The remainder 0*04843 

 will be the moisture still retained by the gas. This is 0*011 

 grain less than my former estimates fi;i*>ii tUi^ wmp^ eadi'io 



