62 YEARBOOK, PUBLIC MUSEUM, MILWAUKEE [Vol. III. 



any steady use and at the present time it is so dilapidated that it is 

 dangerous for animals and can be descended only upon foot. 



The copper mine and a cave said to exist in the mesa near the trail, 

 were the objects of our search. The mine was easily located and the 

 length of its tunnels and shafts proved quite amazing. Many speci- 

 mens of the green and blue copper ores, malachite and azurite, were 

 obtained from the workings and brought back to the surface. A con- 

 siderable search, however, failed to locate the entrance to the cave, 

 and the coming of a heavy rain compelled a hasty retreat up the trail 

 with the exploring half done. As soon as we again stood upon the 

 rim at Grand View point, the cave was in plain sight with the aid of 

 glasses. We had underestimated its distance, never having been 

 within half a mile of it. 



Heavy rains considerably hindered the finishing of the work, but 

 eventually it was all accomplished and we were ready to leave for 

 Milwaukee. Throughout this entire work, we received the hearty 

 cooperation and assistance of all those employees of the Park Admin- 

 istration, the Atchison, Topeka and Santa Fe Railway and the Fred 

 Harvey Company, with whom we came in contact. All were uni- 

 formly courteous and helpful to the last degree no matter what assist- 

 ance was asked, and the Museum has every reason to be most pro- 

 foundly grateful to them for their fine spirit. 



A SUMMER PEREGRINATION IN SEARCH OF • 

 SLIDE MATERIAL 



By R. S. CoRwiN-ii 



The Museum's Lantern Slide Collection is being enlarged with 

 regard for all proper demands which it may be called upon to satisf}^ 

 The demands upon it are varied and requests for sets of shdes on widely 

 different subjects are received. To keep the collection adequately 

 supplied with fresh additions of useful and instructive slides is a large 

 undertaking. 



Fortunately, the task of maintaining the quota of slides in the sev- 

 eral branches of science is shared by all departments of the Museum, 

 since each Curator turns into the collection all slides prepared in con- 

 nection with his field work. In this way the portions of the collection 

 illustrating Ethnology, Natural History, and Travel receive additions 

 of new material regularly. 



"Supervisor of Extension, Milwaukee Public Museum. 



