6 J III-: CHICAGO ACADEMY OF SCIENCES. 



lusca and Arthropoda arc arranged in their proper sequence. De- 

 scending- to the main floor the vertebrates begin with the fishes at' 

 the northeast end and terminate with the primates at the southeast 

 end. The arrangement is largely taxonomic and aims to present 

 nature in orderly succession, from simple to complex. It will be 

 noted that many of the exhibits are of an ecological character. 

 The collections may be thus grouped by numbered cases : 



GALLERY. 



Mineralogy. 



1-2, Gems and gem minerals ; 3, crystallography ; 4, mineral 

 morphology; 5-17, systematic mineralogy; 18, Chicago minerals; 

 19, radioactivity, chemical mineralogy. 



Lithology. 



19, Rock morphology ; 20-23, systematic rock collection ; 23, Chi- 

 cago rocks- 

 Economic Geology. 



24, Building stones, abrasives ; 25-26, useful metals and minerals. 



Geologic Processes. 



27-31, The work of the atmosphere, water, ice, vulcanism, etc. 



Paleontology. 



32, Introductory exhibit ; 33-34, large specimens ; 35-66, gen- 

 eral collection arranged historically from Cambrian to Pleistocene ; 

 67-70, local paleontology of the Niagaran limestone. 



Lower Invertebrates. 



71, Protozoa; 72, Porifera (sponges); 73-74. 83-84, 101-102, 

 Ccelenterata (corals); 75, Vermes, Brachiopoda, etc.; 76-78, 

 Echinodermata ; 131-133, Crustacea; 136-138, Arachnida ; 134-136, 

 synoptic collection of invertebrates. 



Mollusca. 



79-80, Pelecypod morphology; 81-82, 85-93, Pelecypoda ; 94, 122, 

 gastropod morphology; 95-100, 103-108, 122-129, Gastropoda, most- 

 ly marine; 109-110, 113-116, Pulmonata ; 111-112, button industry; 

 117-120, local Mollusca; 121, abnormalities; 122, 130. economic 

 use. 



Insecta. 



139-145, 147-153, Coleoptera ; 146, Diptera ; 154-156, Lepidop- 

 tera; 157, Odonata, etc.; 157-160, Hemiptera, etc.; 160-161, Orthop- 

 tera; 162-163, injurious insects; 163, household pests, silkworm cul- 

 ture ; 164, mimicry, protective coloration, sex dimorphism, etc. 



