SCAMMON: RECORDING EMBRYOLOGICAL MATERIAL. 187 



readjustment. The boxes described above are the permanent 

 receptacles for the collection of slides. When slides are 

 issued for class use different styles of holders are employed. 

 For single slides and small sets the pressed-cardboard con- 

 tainers manufactured by Theodore Schroter, of Leipzig, and 

 carrying from four to six slides, are used. For larger sets, 

 such, for example, as cross-sections of pig embryos, the im- 

 proved whitewood boxes which hold twenty-five slides are 

 quite satisfactory. Each container bears a number both on 

 the box and on the lid. Upon issuing slides in a container a 

 card such as is shown in figure 4 is made out. This gives the 

 number of the container, the identification fraction of the 

 slides therein, their value, and the box from which they were 

 taken. It also bears the signature of the person or persons 

 who may receive the container, together with the date and 

 locker number. To fill out such a card takes but a moment, 

 and after being signed it is held as a receipt until the material 

 is returned. This system has stopped the loss of slides re- 

 sulting from class use. 



A separate set of cards is used for keeping a record of ob- 

 servations on the material in the collection. It is hoped 

 that in the course of time this series of records will become 

 of increasing value, not only as time-savers and in teaching, 

 but also as aids to advanced work. To record such observa- 

 tions a special card such as is shown in figure 5 is used. A 

 glance at the figure wiU explain it. The location readings 

 are recorded in the right-hand column, and consist of the in- 

 dex fraction of the slide and the position of the section upon 

 it. These cards are supplied to students sufficiently advanced 

 to recognize phenomena of value, and are of material advan- 

 tage to them in keeping an accurate record of their work. 

 After being filled out, the cards are collected and classified 

 according to the same general plan as are the literature cards 

 in the Concilium BibHographicum. The main divisions being : 



Ovum. 



Laminae germinis et Embryo primordia. 



Adnexa embryonis. 



Histogenesis et Organogenesis. 



