82 PROCEEDINGS OF THE AMHERST MEETING 



beltiere," and a few others. A few poor plaster restorations are offered 

 for sale in England and Germany, but they are so inferior to those made 

 here that they may be disregarded. 



Unfortunately, restorations of fossil invertebrates are not numerous 

 and few can be purchased. The New York State Museum in Albany has 

 on exhibition some superb restorations of graptolites, eurypterides, 

 cephalopods, and other invertebrates, constructed under the direction of 

 J. M. Clark and Rudolph Ruedemann. These are, without doubt, the 

 best that have ever been made, but, unfortunately for the teaching of in- 

 vertebrate paleontology, duplicates can not be purchased. Lantern slides 

 of these can, however, be made from illustrations in the New York State 

 Geological Survey Reports. A few restorations of invertebrates can be 

 purchased from Ward's Natural History Establishment. 



Geological Specimens 



No practical method has been discovered by which specimens which 

 show T structures, such as veins, folds, dikes, etcetera, and the effects of 

 weathering on different types of rock under different climatic conditions 

 can be distributed by colleges and universities. The trouble and expense 

 involved renders this service difficult, although the replies to the ques- 

 tionnaire indicate that a few teachers are ready to make exchanges. Edu- 

 cational institutions are, consequently, obliged to depend on what they 

 themselves can collect; on what they can purchase from dealers (usually 

 unsatisfactory), and on what they can obtain from the United States 

 Geological Survey and the United States National Museum. 



Few aids to the teaching of geology have been productive of better re- 

 sults than the sets of rocks which were distributed to educational institu- 

 tions by the United States Geological Survey some twenty years ago and 

 which were described by J. S. Diller in United States Geological Survey 

 Bulletin Number 150, 1898. 



The sets of specimens showing weathering of rocks which are now being 

 distributed to educational institutions by the United States National 

 Museum on application, accompanied by the endorsement of a United 

 States Senator or Representative, are excellent for teaching purposes. 



Recommendations 



The committee submits the following recommendations: 

 1. Since considerable apparatus can be advantageously used in ad- 

 vanced courses in geology and some in elementary courses, it is recom- 

 mended that the teachers in graduate schools of geology, and members of 



