The mean (from the observations t f I" re, Kremer>. Kolbo, Herthe- 

 lot. Marianne, and Kohlraiisch ) specific uravities at 1 -V . taking water 

 at it- maximum density ( I ) as IOIMKI, for solutions containing ]> per 

 cent, of hydrogen eldnride. are u'iven in tin- following tal)le in the 

 columns, under the svmlio] x. Their possible error is not less than it 

 and is scarcelv greater than 1". 



K'lM-j 1 Hi' in li.-. 



In lul'.Hi lull'i* .",() 



i:> Ki74! K74i :',: 



_M i 1 1 1 'i 1 1 1 1 1 " '.") 4 1 1 



L nder the letter .S iii the third coltimn is Driven the specific LjTavitv 

 calculated according to the formula N = '. |( J ( .i I (> -f (!> j \\/, 4- ()-().")7 !//-'. 

 until /< = I'-ViM'i, \\hich answers to the hydrate II C'l.ii 1 1 .,( ) mentioned 



above. Abo\e this percentaLTe S=. ( M^~r\ -f (').") 1 I )/, ( I'L'4 ( )y/-. A com- 

 parison of the results obtained by experiment and calculation (,s with 

 >'i sj,o\\s tha; thecur\'e is in perfect harnioiiv \\ p ith the mean result 

 of observation. The necessity of t^'o cttr\'es is alread\- indicated by 

 the tact that the rise of specitic u'ra\'it\" \\"ith an increase of iiercentau'e 



liet \\ecii |( and I 1 ' p.c. tlie ineaii ditl'erence of x, correspi mdinu' \vitli 

 1 p.c. = (!>>. lietxveen l' 1 and .'lo ji.c. = .")!' 1 . and liet\veen MO and 

 I 11 p.<-. = 17''\ judu'inu' from the results of experiment. The inter- 

 medi;i'c solution, IK 'l.fill ., >. i> furtlier dist inu'uislied lv the fact that 

 the van at ion oi l he scci tic L; ra \ it v \\ il h the va ria t ion of t em e rat lire is 



II. n-i,:i ; ,! CMTIV |H,I,[- will, HCI.C.H .0, 



!. . -i l.\ .1 |).ir,ilM,h, ,.| tin- Iliinl 



., r.I. nr. uith r.-ality.rith.'r 



i i .i,-i,|. ali.-n- tin- 



