Yes, I think that is pretty conclusive. His "grits" are some kind of food."putting a small fountain and some grits inside to provide an early meal" suggests a foodstuff. "Even the first day some whole grits chopped up with a knife will be greatly relished, and the day following may be given entire" ditto. "Economy in food; as all eggs, grits, and other dainty food go to the chicks. " ditto. "When the young are a week old, they can have some cracked corn, or oat and wheat grits; oatmeal with about ten per cent. of pure bone- meal mixed with it is excellent." I think that's pretty conclusive don't you?
Although I still wonder why he thinks those "grits" will help the chicks' gizzards to function