Sir,—We understand that Mrs. Margaret Sanger is in danger of criminal prosecution for circulating a pamphlet on birth-problems. We therefore beg to draw your attention to the fact that such work as that of Mrs. Sanger receives appreciation and circulation in every civilised country except the United States of America, where it is still counted as a criminal offence. We, in England, passed a generation ago, through the phase of prohibiting the expressions of serious and disinterested opinion on a subject of such grave importance to humanity, and in our view to suppress any such treatment of vital subjects is detrimental to human progress. Hence, not only for the benefit of Mrs. Sanger, but of humanity, we respectfully beg you to exert your powerful influence in the interests of free speech and the betterment of the race. We beg to remain, Sir, Your humble Servants, (Signed) Lena Ashwell, Dr. Percy Ames, William Archer, Arnold Bennett, Edward Carpenter, Aylmer Maude, Prof. Gilbert Murray, M. C. Stopes, H. G. Wells. _GLOSSARY OF MEDICAL TERMS USED IN THIS VOLUME._ _Abortion_: As soon as the male _sperm_ has met and joined with the female _ova_ any attempt at removing it or preventing its development or further growth is called _Abortion_. _Abortion_ is not to be confused with the _prevention of conception_. The practice of _Birth Control_, founded on the _prevention of conception_ will eventually do away with the necessity of _abortion_. _Abortion_: the expulsion of the fetus before it is viable.—Dorland’s Medical Dictionary. _Abortion_: the arrest of any action or process before its normal completion, as the _abortion_ of pneumonia.—Stedman’s Medical Dictionary. _Birth_: the delivery of a child—Gould’s Practitioner’s Medical Dictionary. _Birth Control_: a new social philosophy dedicated to conscious and voluntary motherhood, and racial betterment. _Conception_: the act of becoming pregnant.—Stedman’s Medical Dictionary. _Conception_: the fecundation of the _ovum_ by the _spermatozoon_.—Gould’s Practitioner’s Medical Dictionary. _Contraception_: the prevention of conception.—Stedman’s Medical Dictionary. _Contraceptive_: anything used to prevent conception.—Dorland’s Medical Dictionary. _Contraceptive_: an agent for the prevention of conception.—Stedman’s Medical Dictionary. _Fecundation_: impregnation or fertilization.—Dorland’s Medical Dictionary. _Fetus_: the unborn offspring of any viviparous animal; the child in the womb after the end of the third month: before that time it is called the _embryo_.