i8a Field Museum or Natural History — Reports, Vol. V. 



requested principals and teachers to express their \*icws and opinions 

 as to ways by which the desire would be accomplished. Cases are being 

 loaned to 278 elementary schools and to their branches having a daily 

 enrollment dl a hundred or more students. It has been found advisable 

 to increase the length of time allowed for cases to remain at one time in 

 a school from two to three weeks. This extension in the duration of the 

 loan period, not only gives the pupils an additional week for obser\*ation 

 and study of the cases, but enables the Dci>artment to arrange and 

 maintain a reliable schedule for the delivery and collection of cases. 

 To accomplish this it was necessary to di\*idc the schools in four sections 

 and to form groups of schools in each section. At the beginning of the 

 scholastic year the circulation of cases starts with the delivery of three 

 cases from the Muscimi to each of the first group of schools located in 

 what is designated as the first section. After each school in each group 

 of the first section has been loaned three cases, deliveries arc made in 

 a similar way to schools of the third section. Three school weeks arc 

 rcquirc<l for the delivery of cases to the first school of the first group 

 located in the first section to the last school in the last group of the third 

 section. When these deliveries have been made, the cases arc collected 

 from these sections in the order in which they were delivered and 

 distributed to groups of schools located in the second and fourth sections 

 respectively. This s>*stem is maintained throughout the school period. 

 By means of receipt cards the circulation record of each case is kept. 

 Each card Ix^sides bearing the same letter and number as shown on the 

 case and the labels which accompany it, has spaces for recording the 

 name of the school to which the case has been assigned, the signature 

 of the principal or teacher rccci\*ing it, the date it was received, the 

 number of pupils stud>'ing it and the length of time it was retained. 



