Affections of the chest which prevent due aeration of the blood induce contractions of the womb, as shown experimentally by Brown-Sequard.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Gradually dyspnoea would set in, the dreaded croup begin to be heard, and difficulty of breathing developed at times to such a degree that the little one would use every effort to secure breath, the aeration of the blood growing less and less, and cyanosis-that is, an intense blueness of the face and hands-becoming evident, till finally the child died slowly in all the agonies of asphyxiation, while doctor and nurse stood sadly by, absolutely powerless to do anything to relieve the heart-rending symptoms.
"Makers of Modern Medicine"
James J. Walsh
It is partly a spasmodic phenomenon I am sure, for the aeration of my tissues, judging by the color of my lips, seems to be sufficient.
"The Letters of William James, Vol. II"
William James