The Systematic Motions of Sun-spots. 



The first column of Table IV requires further explanation. It 

 represents Carrington's diurnal motions. According to his words, 

 "The signs prefixed to the diurnal motions are such that + in 

 longitude indicates rotation faster than 14° 11' per diem (cor- 

 responding to the assumed period of 25. 380 days) and — rotation 

 slower than that." The plotted numbers are shoAvn graphically in 



