204 



PROCEEDINGS OF THE CALIFORNIA 



Dr. C. T. Jackson read the following paper, relative to the 



Big Trees of Calaveras County. 



MEASUREMENTS OP THE HEIGHT AND CIRCUMFERENCE OF TWENTY-FIVE 



OF THE "BIG TREES," (SEQUOIA GIGANTEA,) IN CALAVERAS COUNTY 



BY DR. CHARLES T. JACKSON AND MR. JOSEPH B. MEADER 



AUGUST 2d AND 3d, 1865. 



Instruments made use of: — 



1. Sir H. Douglass' Reflecting Semicircle ; (Cary). 



2. A Reflecting Level ; made by J. H. Temple, of Boston. 



3. A common Measuring Tape. 



The horizontal point was fixed upon each tree, and the angle measured by the 

 Reflecting Semicircle, and protracted by it. 



The circumference of the trees was measured above the swell of the roots, 

 about six feet, where the stem takes its proper form. 



Several measurements, originally made with too high an angle, were taken over 

 again witli a longer base, so as to avoid the error of refraction in the glasses of 

 the mirrors. 



We trust, therefore, that the following measurements will be found to be 

 correct. 



NAME OF TREE. 



Arbor Vitae Queen 



Pride of the Forest, 



Andrew Johnson 



Bay State 



Edward Everett 



Henry W. Beecher 



W T illiam C. Bryant 



Abraham Lincoln 



Mother of the Forest* \ \ \ 



Daniel Webster 



General Jackson 



General Scott 



General Washington 



Beauty of the Forest 



Two Sentinels 



Old Kentucky '.'.'.'.'.'.'.'.'.'.'. 



Mother and Son 



T. Starr King 



Trinity 



Salem Witch 



Henry Clay 



Empire State 



Vermont 



Granite State - 



John Torrey, (Nobis) " . 



(All the above-named trees are the Sequoia Gigantea.) 



A Sugar Pine, (P. Lambertiana) 



A Yellow Pine, (P. Engelmann) ""' 



Another of same species 



Bark off Mother of the Forest to the height of 121 feet. 



