206 EXPLOEATIONS ACEOSS THE GREAT BASI^ OF UTAH. 



ditions recorded on this exploration. The following are actually recorded differences 

 of temperature between the warmest and cohtest time of the day, and they would, in many 

 instances, be considerably larger, if the maximum and minimum temperatures had been 

 observed. As we generally staid in a camp from afternoon till morning the ampli- 

 tudes are mostly given between the high temperature of the afternoon and the low one 

 of next morning, which are apt to give a little larger amplitude than the maximum 

 and minimum of the same day would exhibit. We have observed as far east as Little 

 Blue River, in Southeastern Nebraska, October 7th, 3 p. m., 75°; October Sth, 5.45 a. 

 m., 34°; difference, 41° Fahrenheit. 



Platte River, below Fort Laramie, September 20th, 3 p. m., 85°; September 21st, 

 5.15 a, m., 36°; difference, 49° Fahrenheit. 



Near the Red Buttes, August loth, 3.15 p. m., 82°; August 16th, 4.45 a. m., 37°; 

 difference, 45° Fahrenheit. 



Upper Sweetwater River, September 9th, 3 p. m., 70°. 3 ; September 10th, 5.45 a. 

 m., 26°.5 ; difference, 43°. 8 Fahrenheit, 



Green River, August 3Cth, 3 p.m., 83°; August 31st, 5.30 a. m., 39°; difference, 

 44° Fahrenheit. 



^Black Fork, September 1st, 4 p. m., 79°; September 2d, 5.30 a, m., 35°; differ- 

 ence, 44° Fahrenheit. 



Bear River, September 26th, 3 p. m., 56°; September 27th, 6 a. m., 11°.5; differ- 

 ence, 44°. 5 Fahrenheit. 



Echo Canon, September 10th, 6 a. m., 25°.5 ; 1.15 p. m., 75°; difference, 49°.5 

 Fahrenheit. 



West of Weber River, September 11th, 4 p. m., 80°.5f September 12th, 5 a. m., 

 32°.5 ; difference, 48° Fahrenheit. 



Timpanogos Gallon, September 20th, 3.30 p. m., 83°.5; September 21st, 6 a. m., 

 35°.5; difference, 48° Fahrenheit. 



Camp Floyd, September 17th, 6 a. m., 40°; 12 m., 91°; difference, 51° Fahrenheit. 

 Camp Floyd, January 3d, 7 a. m., 0°.5; 2 p. m., 31°; difference, 31 °.5 Fahrenheit. 

 Camp Floyd. January 1 sth, 7 am., 5°.3; 2 p. m., 41°.7; difference, 36 °.4 Fahrenheit 

 Camp Floyd. April sth, 6 a. m., 32°.7; 12 m., 71°; difference, 38°.3 Fahrenheit. 

 Camp Floyd, April 22d, 5.25 a. m., 20°; 3.15 p. m., 73°.3; difference, 53°.3 

 Fahrenheit. 



Salt Lake Desert, August 1st, 4.30 p. m., 102°; August 2d, 4.30 a. m., 56°; differ- 

 ence, 46° Fahrenheit. 



^ Reese River, May 28th, 3 p. m., 76°; May 29th, 4.50 a. m., 22°; difference, 54° 

 Fahrenheit 



Over 40° difference was frequently observed in Woodruff Valley, the deserts near 

 Carson Lake, and in other valleys of the Great Basin. 



As the relative humidity was frequently small, the difference between the reading 

 of the dry and wet bulb thermometers was frequently considerable. We must, how- 

 ever, bear in mind that this difference is no direct measure of the relative humidity. 

 The following are some of the extreme values observed dining the survey : 



Fort Kearney, October 3d, 3 p. m., dry bulb, 87°.5; wet bulb, 58°.7 ; difference, 

 2S : .S Fahrenheit. # 



