HANDBOOK FOR THE DEPARTMENT OF GEOLOGY. 591 



Wheeler, U. S. Engineer Department. These comprise some 680 speci- 

 mens which, though but little studied by modern methods, are, together 

 with those of the Hay den surveys, kept together for purpose of reference. 



(10) Canadian geological survey. — A stratigraphic series comprising 

 some 854 hand specimens of rocks from the various geological horizons 

 of Ontario, Quebec, New Brunswick, and Nova Scotia, received from 

 the Canadian authorities at the close of the Centennial Exposition at 

 Philadelphia in 1876. 



(LI) Pigeon Point collection. — This comprises 400 specimens illustrat- 

 ing various contact phenomena, as occurring at Pigeon Point on the 

 north shore of Lake Superior, and as described by Prof. W. S. Bailey 

 in a forthcoming bulletin of the U. S. Geological Survey. 



(12) Menominee Valley and Marquette River collections. — These com- 

 prise 254 specimens illustrative of the dynamic metamorphism of erup- 

 tive rocks as described by Dr. G. H. Williams in Bull. No. 62, U. S. 

 Geological Survey. 



(13) Alaska collections. — These comprise some 250 specimens miscella- 

 neous rocks collected mainly by W. H. Dall in 1866-68. 



(14) Missouri. — A series comprising 114 characteristic rocks from 

 southwestern Missouri, as collected and described by Prof. E. Haworth. 

 (Catalogue Nos. 38618-38741, inclusive.) 



(15) Bear Paw Mountains, Montana. — A small series eruptive, meta- 

 morphic, and drift rocks from the Bear Paw Mountains, collected by 

 Dr. A. C. White and J. B. Marcou in 1883. (Catalogue Nos. 28666-28743, 

 inclusive.) 



(16) St. Gothard Tunnel. — A series of metamorphic rocks, comprising 

 some 81 specimens received from the Swiss Commissionerto theCenten- 

 nial Exposition at Philadelphia in 1876. (Catalogue Nos. 37495-37574.) 



(17) Commander Islands, coast of Kamschatka,— A small series of the 

 characteristic rocks of these islands, collected by Dr. L. Stejniger in 

 1S82-'S3. (Catalogue Nos. 37937-37972.) 



(18) Australian collections. — A series of some 355 rocks from Victoria, 

 Australia, as received from the Australian centennial commissioners 

 in 1876. (Catalogue Nos. 2812L-28475, inclusive.) 



(19) Brazilian collections. — An interesting series of 266 specimens 

 eruptive and metamorphic rocks received from the governmental geol- 

 ogist, O. A. Derby. (Cat, Nos. 69759-70027.) 



(20) District of Columbia collections. — This includes a series of several 

 hundred specimens, collected mainly by Prof. Thomas Bobinson at in- 

 tervals of every fifty feet in the tunnel of the Washington Acqueduct 

 extension. 



To the extent that facilities have permitted, sections for microscopic 

 study have been prepared from the rocks of both the exhibition and 

 study collections. At the date of writing, the number of these slides 

 amounts to some 4,000. Of these, 2,700 are of rocks in the building- 

 stone collections, and which were prepared in large part under the di- 

 rection of Dr. G. W. Hawes. 



