192 
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As further 10 — ny mk where 2 represents the melting heat, this 
relation becomes 
dp, 2h 
dt vt’ 
dp, is negative. We have thus a sinking of the melting point and 
there is no osmotic pressure. The osmotic action appears only when 
after having prevented the volume from increasing we bring, the whole 
system into semipermeable connexion with a solution of the original 
concentration «, and under the pressure of the system. The pressure 
in this whole system increases everywhere and in all directions by 
an amount just equal to — dp, (a positive amount). Except for the 
sign the formula for the sinking of the melting point therefore 
becomes the same, or, when dp is written for the increase of the 
osmotic pressure, 
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