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CARNEGIE INSTITUTION OF WASHINGTON. 



museums, he has been able to make similar studies on a number of 

 other primate fetuses. A list of this rare material follows: 



Three papers by Dr. Schultz, based on the study of this material, 

 are now in press. One of these concerns his observations on the 

 proportions of three colobus fetuses, as compared with those of the 

 human. He finds the trunk to be much longer and slenderer than 

 that of the human fetus, the chest narrower, and the position of the 

 nipples and umbilicus relatively higher. The extremities are rela- 

 tively shorter and the hands and feet more slender. The head is 

 smaller, but the face, in proportion to the brain part of the head, is 

 larger than in the human fetus. In general, ossification in these 

 colobus fetuses corresponds very closely to that of human fetuses of 

 corresponding stages of development. In both colobus and man the 

 head grows more slowly than the trunk, and the lower extremities 

 faster than the upper ones, growth being more rapid in the distal 

 than in the proximal parts. In both, also, the relative length of the 

 cervical and thoracic portions of the spine decreases during growth, 

 while that of the lumbar portion increases. In the colobus the thumb 

 is rudimentary, but still retains a short metacarpus and one phalanx. 

 The degree of reduction of the thumb and the age at which it disap- 

 pears completely from the surface of the hand vary in different species. 

 A fact of special interest is that in all of the colobus fetuses several 

 sinus hairs were present on the inner side of the forearm, proximal to 

 the carpus. These were more conspicuous and of relatively greater 

 length in the youngest fetus than in the two older ones. In the adult 

 colobus no trace of these hairs can be seen. They correspond to the 

 vibrissse found in all prosimiae and have heretofore been believed to 

 be missing in all monkeys. Their discovery in the fetus, therefore, 

 in which they develop apparently only to disappear later, furnishes 

 further proof of a close relationship between lemurs and monkeys. 



In another paper Dr. Schultz gives the results of a metric and 

 osteological study of fetal and adult specimens of the Guiana howling 



