110 CARNEGIE INSTITUTION OF WASHINGTON. 



tion of Washington, 400 specimens have been collected each year. On 

 an average, about 60 physicians have contributed each 100 specimens, 

 and the whole collection has been obtained from 509 physicians residing 

 in 46 States and countries. As might be expected, many of these physi- 

 cians are connected with hospitals, and, as far as can be ascertained, 

 59 contributing hospitals are now upon our lists. The largest number of 

 specimens came from Maryland, 899 coming from this State alone, 

 most of them from Baltimore. We have received 174 specimens from 

 New York, 59 from Michigan, 56 from Pennsylvania, 41 from the Dis- 

 trict of Columbia, 43 from Illinois, 37 from California, 35 from Ohio, 

 30 from Massachusetts, 27 from Connecticut, 26 from New Jersey, 22 

 each from Wisconsin and Maine, 21 from South Carolina, and 27 from 

 the Philippines. The remaining specimens, less than 20 for each 

 State, came from 31 States and countries. In the collection there 

 are 23 Filipino embryos, 6 Chinese, 4 Japanese, 3 American Indian, 

 1 Korean, and 86 embryos known to be from the American negro. 



The Johns Hopkins Hospital contributed 99 specimens, and these 

 came mostly from the gynecological and obstetrical clinics. Nine 

 other hospitals in Baltimore sent specimens, 27 coming from the 

 Hebrew Hospital and 16 from the Church Home and Infirmary. 

 Eleven hospitals in New York contributed : Bellevue 35, Kings County 

 27, and the Lying-in Hospital 18 specimens. A complete statement 

 regarding the collection is now being prepared for the press. 



I wish to emphasize again the importance of this cooperative 

 research undertaking, in which, on account of their altruisitic spirit, 

 over 500 persons, most of them unknown to us personally, have taken 

 part. Without their contributions our work would be impossible. 

 The best specimens are sent to us from hospitals. From among them 

 it has been possible to obtain several rare ones in utero, the organ 

 having been removed for various reasons. Our colleagues in Baltimore 

 have been especially considerate in sending these prizes directly to our 

 laboratorj^, and sometimes thej^ have arrived with the embryo still 

 living. 



There are 141 publications which are based in part or entirely upon 

 this collection. Most of them are by members of our staff, but a fairly 

 large nmnber are by colleagues in other institutions, who have come 

 here to study the collection or to whom we have loaned individual 

 specimens. In a few instances rare specimens in other collections have 

 been brought here to be compared with our embryos and to be worked 

 up for publication. 



In the past year several general studies have been published, for 

 which this collection has been utilized as a basis. They are as follows: 

 A general discussion on the development of the fetus by Professor 

 Warren H. Lewis, one on the development of the heart by myself, 

 and one on the development of the digestive tract by Professor William 



