The Principles of Mitscum Aiimiiiistratiou. 219 



6. Specimens are often most useful when placed in a reserve or stud}- 

 series, to be tised by special students or to be exchanged, or given to 

 other museums. 



7. Advancement in a museum is effected, not only by accession and 

 enlargement, but by the constant substitution of better specimens for 

 study and exhibition, by improvements in methods of display and labeling, 

 and by publishing contributions to knowledge based upon the collections. 



B. — TIIK STUDY SERIES. 



1. The effectiveness of a museum as an agency for the increase of 

 knowledge and for higher education depends upon the maintenance of a 

 study series, the administration of which should be upon a plan quite 

 different from that employed for the exhibition series. 



2. \Miile it may be desirable to exhibit publicly many large or inde- 

 structible objects belonging to the study series, this series should be as a 

 rule permanently arranged in laboratories and storerooms not accessible 

 to the general public. 



3. The study series is the storehouse from which the exhibition series 

 is replaced or extended, and from which the needs of other museums 

 may be supplied. 



4. Objects of the following classes should never ])e placed in the 

 exhibition series : 



(yO) Those which are unique or very rare, and liable to destruction from 

 exposure to light and dust. 



ib) Those which are the tyjoes of descriptions, except when large and 

 indestructible. 



(r) Those belonging to series which are often required for purposes of 

 comparison b}' .students. 



5. In collecting materials for the study series, the needs of the future 

 as well as those of the present should be kept in view. Specimens in 

 this .series .should therefore be acquired in quantities sufficiently large to 

 meet the needs of students hereafter. While nothing of value .should 

 l)e lost, it is questionable, however, whether material should be sought 

 in large quantity when there is no indication that it will .soon be needed. 



6. The fact that an object is common now is no indication that it will 

 remain .so, and the abundance of any kind of ol^jects in a given locality, 

 is often good evidence that it is rare in most other parts of the world. 



7. vSpecimens in the .study .series, though hidden from .sight, .should be 

 the object of care as solicitous as that bestowed upon the exhibition 

 series, and should be available upon demand, like the books in the stack 

 rooms of a library. 



C. — THE EXIIIBITIOX SERIES. 



I. The "People's mu.seum" is that portion of a maseum which is 

 on public exhibition; the " Student's mu.seum" that which is devoted 



