Can cooling rate affect the yield of crystals?

Cooling an acetanilide mixture with an ice bath has resulted to a heavier amount of acetanilide crystals than cooling the container slowly (setting it aside in the lab). I have gotten different explanations from this. Some say that increasing the cooling rate can include impurities which increases the mass of the crystals. But according to others, decreasing the cooling rate allows the crystal to grow which increases its overall yield.


