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Therefore, I think that the placenta should no longer be called a uterine liver, but rather a uterine lung. Although Mayow's attempted analysis of respiration of the chick embryo in ovo is less than successful, his views on fetal respiration were soon accepted by many, and his tract stands as a great contribution to physiological embryology.
Now, it is evident that if Mayow's answer was a true description of the process of calcination, or combustion, it should be possible to separate the calcined substance into two different things, one of which would be the thing which was calcined, and the other would be that constituent of the air which had united with the burning, or calcining, substance.
I was thinking any time that's agreeable if you was to lodge across the harbour for awhile, with the Mayows Cherry Mayow's a friend of yours we could put up the banns and all shipshape." He found himself outside the door, mopping his forehead. This was the second rash thing that John Penaluna did.
This experiment proved that the calcination of mercury in the air consists in the combination of a constituent of the air with the mercury. Mayow's supposition was confirmed. Lavoisier made many more experiments on combustion, and proved that in every case the component of the atmosphere which he had named oxygen combined with the substance, or with some part of the substance, which was burned.
It seems clear to us that the one method of proving the accuracy of Mayow's supposition must be, to weigh a definite, combustible, substance say, a metal; to calcine this in a measured quantity of air; to weigh the product, and to measure the quantity of air which remains; to separate the product of calcination into the original metal, and a kind of air or gas; to prove that the metal thus obtained is the same, and has the same weight, as the metal which was calcined; and to prove that the air or gas obtained from the calcined metal is the same, both in quality and quantity, as the air which disappeared in the process of calcination.
This proof was not forthcoming until about a century after the publication of Mayow's work. The experiments which furnished the proof were rendered possible by a notable discovery made on the 1st of August 1774, by the celebrated Joseph Priestley.
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