CHILDREN ON ‘ALL FOURS’ ADDITIONAL REPORTS T W O FIGURES The article on “Quadruped Progression in the Human C.hild,” in the last number of this Journa1,l has evidently aroused more than the usual attention, as a part result of which I am able to report five additional cases. All these five reports, moreover, come from well-educated parents and give some interesting details which could hardly be obtained by an outsider. My thanks are herewith tendered to all these correspondents. The reports follow. CASE I I am taking the liberty of calling your attention to the case of one of my daughters. At the age of about 104 months she began to adopt the practice of running on all fours and within a couple of weeks attained great proficiency and high speed. Before she was a year old she went u p stairs and down stairs backward in the same way. A t the same age she would stand erect but did not adopt the practice of walking on two feet until over 14 months old. She adopted her peculiar method of locomotion without instruction and so fa r as we know without suggestion. She was in other respects a normal child and is now a t the age of nineteen a senior in RadclXe College. I enclose a photograph showing the child in action while running rapidly as the blurring of the moving hand and foot shows. v. t. y. ..... CASE I1 I was much interested in an account of your article on babies that run on all fours, because that is the way my own baby daughter ‘Am. J. Phys. Anthrop., 1927, X, no. 3, 347-354. 123 AMERICAN JOURNAL O F PHYSICAL ANTHROPOLWY, VOL. XI, NO. OCTOBBR-DECENBER, 1927 1 124 ALEB HRDLI~KA Case I Girl, eleven months old, white, U. S. A. (old Amer.), running on all fours. Case I1 A girl, about eleven months old, white, U. 5. A. (old Amer.), running on all fours. CHILDREN ON ‘ALL FOURS’ 125 moved about previous to walking. I am enclosing a small photograph. You will notice that one foot is flat on the ground. I never thought of this trait as being unusual until I read of your paper. The photograph is one of a series of snapshots I was taking. The baby was constantly moving and hard to pose, so I just shot at random, hoping to get some good pictures. This is one of the results. The baby a t first propelled herself by sliding on her stomach, pushing with her hands and feet. She began this a t the age of 9 months. A t the age of 104, she began walliing on her hands and feet, with her knees off the ground. A t times, when moving slowly, or when still, she had her knees on the floor. Most of the time, though, she moved at her utmost speed, on hands and feet. At the age of 10 months, she began pulling herself u p and walking by leaning against the mall, or by holding on to furniture. A t 1year and 2 weeks, she started walking by herself. She had good control, no fear, and stepped right off. Unlike many babies who are wobbly and fall after walking a short distance, this baby walked steadily, could stop and stand still, o r t u r n around and walk in a different direction at will. She could raise and lower herself a t will without help. Y. v. t. ..... CASE: I11 I read with interest of your article on infants walking on all fours. I realized my child was unusual in this respect but was hardly enough of a n egoist to realize he was so much so; I merely thanked the gods that, by running on all fours he did not get the knees of his stockings so dirty. He started crawling when he was about ten months of age and started walliing at fifteen months, though f o r about four months after that he walked on all fours, when in a hurry. H e never crawled as ordinary babies do, and people invariably laughed when they saw him going around appearing very much similar to a bow-legged bull pup. H e always sat u p and refused to move until the attention of the laught,er was away from him. I attributed his peculiar method of locomotion to never having been around a baby who crawled in the regulation manner. He was always with his sister who is two years his senior. H e is normal in every other respect. . . . We are of the white race, Nordic t o be explicit. Sincerely, MRS. L. L. ABERCROMBIE. 2631 14th Avr., W., Smttle, Wadi. 126 ALES HRDLI~KA CASES IV, T I have been very much interested in your paper in the last number of the Journal of Physical Anthropology on plantigrade progression in infants. You may be int.erested in two other cases which 1 have seen. Of my three children, the oldest, when about eight or nine months old, progressed by irregular rolling and sliding motions. H e next learned to stand, supporting himself by furniture. Then he crept in the normal manner for perhaps a month, after which for a period of a month to six weeks, he walked on all fours in the manner described for some of your cases. Neither of the other children ever showed any inclination in this direction. This last summer in the Sierras I saw a Washoe Indian baby girl of about a year who r a n around actively, and not ungracefully, on all fours. She was much more natural in her actions than was my baby during the period when he progressed on all fours. Very sincerely yours, C. H. DANFORTH, Stanford University. BRIEF RI%XME The total number of reported individual cases with this physiological peculiarity now reaches eleven, of which five are white American. No sex difference is as yet noticeable; the white children comprise two boys and two girls. The peculiarity begins to manifest itself evidently about the t,enth month and may last a variable time. And so f a r but single instances of the phenomenon have been reported from individual families. More reports are desirable.