APPENDIX TO THE REPORT OF THE SECRETARY, 75 



The heavy growth of timber indicates and fosters a comparatively 

 moist climate. The park is a region of lakes and swampy tracts, of 

 springs, and abundant perennial streams. The summer season is short. 

 While frosts may be expected any night in the >'ear, the winter holds 

 until June and commences again in September. July and August 

 usually aflbrd fine but cool w^eather, with cold nights; but September 

 brings frost and snow. 



The third division, under Mr. F. A. Clark, surveyed the Wind Eiver 

 Mountains, a portion of the Wyoming Eange, the Gros Ventre liange, 

 ■with a large area in the Snake Eiver Valley. Mr. Clark made 31 gradi- 

 enter stations and 15 compass stations. The area lies between latitude 

 43° and 44° and longitude 109° 15' and 111°. This includes the upper 

 portion of the Wind Eiver Mountains, with portions of the Wyommg 

 Eange, the Gros Ventre Eange, and portions of the Shoshone Mount- 

 ains and the Owl Creek Eange ; also the sources of Green Eiver, Hoback 

 Basin, and upper waters of Wind Eiver. Mr. St. John acted as geolo- 

 gist and Mr. N. W. Perry as mineralogist to this party. Their reports 

 will prove of general interest. Mines of gold, silver, iron, and vast beds 

 of gypsum, as well as many other minerals, were found. 



Photography. — In the prosecution of the field-work of the survey dur- 

 ing the past season a photographic division was again put in operation, 

 after an interval of two years, under the leadership of Mr. W. H. Jack- 

 son, who has been connected with the survey as its i^hotographer during 

 the i)ast nine years. 



Leaving Point of Eocks, on the Union Pacific Eailroad, on July 24, 

 the first points of interest were reached on the western flank of the 

 Wind Eiver Mountains. Two side trips, undertaken in connection with 

 Mr. AVilson, in charge of the priraarj- triaugulatio.i, were made to the 

 crest of the range, and some grand views of that remarkable region 

 were obtained. From the summit of Fremont's Peak views w ere made 

 of an immense glacier now occupying its eastern slope. Fine views 

 w^ere also obtained of the great glaciated plateau lying between the 

 plains and the crest of the range. 



Proceeding next to the vicinity of the Grand Tetons, lying to the east 

 of the headwaters of the Snake Eiver, several magnificent views of the 

 remarkable range in which they occur were made fi'om the neighborhood 

 of Jackson's Lake. 



Eeaching Shoshone Lake the 18th of August, the entire month follow- 

 ing was devoted exclusively to photographing the remarkable phenomena 

 connected with the hot springs and geysers of the various basins within 

 the Park. Especial attention was paid to the almost unknown but ex- 

 ceedingly interesting features of the new Shoshone and Eed Mountain 

 Basins. The ''Fire Hole" and "Mammoth Hot Spring" Basins were 

 again gone over, and the experience derived from the work done here in 

 former years shows its benefits in the remarkably eftectiv<i views obtained 

 this season. At this latter basin many detailed as well as general views 



