Sept. 25,1880. SCHOOL-UEADACHE FROM OVER-STtJDY VERSUS DEFECTIVE VENTILATION. SIR,-I have read with great' intierest and ben-efit, as we all have, Dr. Crichton Browne's far-sighted and svggeitive address, deliveted to the Physiological Section at the Cambridge meeting. In this address, he quotes a paper of Dr. Treichler's, read last year in Germany, in which it is stated "that one-third of lthe pupils attending schools in Germany and France suffer from headaches, which destroy much of the

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... ess of life, and blunt the acuteness of the faculties". I do not doubt t-he fact, although, as Dr. Browne remarks, it is probably -exaggerated; but I much doubt the explatnation. I believe myself that the &ause of'these headaches is, in mostcases, the defettive ventilation of scho6ls' ith those twto euntries. In both, littleor -no attentiont is paid to methodical, or-indeed to any kind, of eSective ventilation in the localities where bodies of children orof gtown-up people are congregated, or even in every-day domestic life. Physiology Iin genleral, and that of the respiratory organs in particilar, is taught and learnt in the medical schools, andthen disearded by thedoctors as well as by the public, in the rotttine of-daily-or public life.