On dry incubation the humidity is to remain low somewhere between 20 and 35 percent but the correct humidity in the incubator insures that the bubble does not grow to a certain degree by the time the embryo is ready to hatch, but that the air bubble does not enlarge to the point of depleting the fluids that are necessary for the final growth of the embryo. Ok I am not sure what the growth rate of the air bubble should be in dry incubation. On day seven when candling my eggs which they are showing veining the air bubble seemed to be way too large. It has depleted a good bit of moisture and am wondering if this moisture that was loss is detrimental to the growth of the embryo. I have brought my humidity up to 41% and am contemplating on moving it higher but before I do I was going to try and get the thoughts of those on BYC which will guide my determination on what I should do. First: Question on moving the humidity higher at this stage of incubation would it slow up the shrinking of the air bubble without hurting the growing embryo? Second: Do I increase humidity or not? Now this is a dry run on anticipating of hatching some turkey eggs so these chicks are my gage on if I have learnt enough to be successful at hatching turkey eggs.