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A Service in Lantern Slides 139 of interest to him to ascertain this ict. The reports as turned over to le Board of Directors cover the num- [ir of borrowers, the number of slides id the number of lanterns circulated uring each month. Each lantern is umbered and has lying in the com- artment in the storage shelf a good zed card marked with the number of le lantern. As the lantern goes out le name of the borrower is placed on le card with the date and when the intern is returned the date of return ; checked off. This enables us to tell t a glance who has had any individual intern in case breakage is discovered ue to any carelessness of the bor- rower. Our circulation totals since le department was organized, are as )llows: Lan- Sets Slides terns )ec., 1919—May, 1920.. 1,598 104,385 297 lay, 1920—May, 1921. .6,252 399,272 716 fay, 1921—Apr., 1922. .4,484 270,926 1,482 I have purposely neglected making ny mention of our source of supply mtil this time as this is naturally the nost important feature to be con- idered. We expect to incorporate in )ur Fall Catalog about 50,000 titles nd about 500 topics. The Society naintains a well equipped dark room nd has available in private hands a tactically unlimited supply of nega- ives which can be borrowed for mak- ng slides. Most of our slides, never- heless, are purchased. It is known hat we are in the market for good tides and we are continually in receipt jf communications from private in- dividuals who have material for sale. Our system presents one great ad- vantage. It has always been consid- ered necessary to have on file a nega- tive of each slide so that in case of breakage the slide could be replaced and the set kept intact. While not in any way criticizing or deprecating this system, it is obvious that there are certain disadvantages. In many in- stances it is impossible to secure nega- tives and the proper filing and classi- fying of thirty or forty thousand negatives in no simple task. We are not meeting nor pretending to meet any specific demand nor have we any set schedule or syllabus. If a set of slides become worn out or damaged to a point where it is no longer useful, such slides as remain are removed from circulation, placed in storage boxes and when such have accumu- lated, a new lecture is arranged with whatever new material may be avail- able. Our borrowers represent every class and there is hardly a topic which will not be called for sooner or later. It is interesting to note that out of our entire topics catalogued, more than eighty per cent have been circulated in a single month and there is no set of slides on our shelves today which has not been borrowed. Most of our sets are arranged in manuscript lectures and all of them are being prepared in this form as rapidly as possible. The slides are kept in uniform storage boxes holding about seventy-five (75) slides, each box being numbered to correspond