CARE AND UTILIZATION OF THE COLLECTION. 29 



second group. In order to expedite the work of locating a specimen, each is entered 

 upon the card catalogue according to its length in millimeters, the groupings 

 being a millimeter apart. All normal embryos of the same length are entered upon 

 the same card, with notations as to whether or not they have been cut into serial 

 sections. The pathological specimens are arranged upon cards according to type, 

 but the specimens of a given type or group are also arranged in order of size. In 

 this way it is quite easy to locate a specimen of a given size in any group after it 

 has been sectioned. It can be seen at a glance, therefore, that we have here a list 

 corresponding to all the embryos in the collection, both those which have been cut 

 and those which have not. There are similar cards of all drawings, models, and 

 photographs, and these, in a general way, are arranged according to their anatomi- 

 cal topography. For instance, on one card will be found left profiles, on another 

 right profiles, on another hands, etc. 



It is by no means a simple matter to catalogue the miscellaneous material. 

 We have found it necessary to carry a card for ovaries, another for tubes, and so 

 forth, as shown in the second column of figure 2. In the course of time we shall 

 add cards for partial series and for the different tissues and organs of the larger 

 fetuses. 



As will be seen from the appended bibliography, our earliest studies in embry- 

 ology were made from the viewpoint of gross anatomy. The first paper deals 

 with the entire anatomy of an embryo 7 mm. long, and therein are recorded several 

 important discoveries. (As stated before, the model made for this study was by 

 far the most elaborate piece of modeling that had as yet been undertaken.) Fol- 

 lowing this were papers written for the Reference Handbook, which are more 

 general in character. Finally, the names of collaborators began to appear in the 

 list, the first paper being by J. B. McCallum, on the histogenesis of striated muscle. 

 As the interest of new investigators was enlisted, the scope of the work gradually 

 broadened to include almost the entire field of anatomy, and the 159 papers 1 , 

 which are dependent largely upon our collection, may be classified as follows: 

 18 were written for the purpose of propaganda, as efforts have been made from 

 time to time to gain the interest of physicians who might be in a position to send 

 specimens. It must be admitted, however, that these individual appeals brought 

 few results. After such an appeal we would, perhaps, receive two or three speci- 

 mens. Then there would be a period of quiescence, and we would have to content 

 ourselves with studying again with greater care the detailed anatomy of small 

 portions of an embryo, since material for more extensive surveys was lacking. 

 But as the collection gradually enlarged, papers on embryometrics were published. 

 These number 14 in all, and include such questions as the age of embryos and 

 curve of growth. As might be expected, most of the studies have been on anatomy, 

 although a single specimen calls for a great deal of time in order to work out the 

 form and relation of the organs. The papers on embryo-anatomy fall naturally 

 into subdivisions which have been recognized by anatomists for centuries. There 

 are 9 papers on topographical embryology, 10 on osteology, 9 on myology, 25 on 



' These 159 papers include only such as appeared before 1918. A considerable number have been published since then. 



