Also, in the same passage Marx says:

Therefore, even when prices, speed of monetary circulation and economies in the use of the means of payment are given, the quantity of money in circulation no longer corresponds with the mass of commodities in circulation during a given period, such as a day

But in back then, he says that:

 While prices remain constant, the quantity of the circulating medium may increase owing to an increase in the number of commodities in circulation, or a decrease in the velocity of circulation of money, or a combination of the two. On the other hand, the quantity of the circulating medium may decrease with a decreasing number of commodities, or with an increasing rapidity of circulation.

 With a general rise in the prices of commodities, the quantity of the circulating medium will remain constant, if the number of commodities in circulation decreases proportionally to the increase in their prices, or if the velocity of monetary circulation increases at the same rate as prices rise, the number of commodities in circulation remaining constant. The quantity of the circulating medium may decrease, owing to a more rapid decrease in the number of commodities, or to a more rapid increase in the velocity of monetary circulation, in comparison with the fall in the prices of commodities.

In page 218. Then does this paragraphs losing their validity? Since number of commodities in circulation losing their relation with velocity of money in circulation because of the money as means of payment.