486 



(1) The period of incuLation of the disease prior to its first appearance, i. e. the 

 greatest length of time a tree may be affected before it shows any symptoms of yel- 

 lows. 



(2) The exact nature of the contagion. 



(3) Its method of spread other than by bud iuoculatiim. 



The second part of this report is devoted to peach rosette, a disea^se 

 prevalent in Georgia, whicli was at first thought to be a variety of 

 peacii yeHows. The characteristics of the disease are described and 

 an account is given of inoculation experiment.^. 



The following summary is taken from the bulletin : 



(1) The rosette, as now understood, differs from peach yellows in the following 

 particulars ; 



(a) The more tufted character and somewhat different appearance of the diseased 

 growths. 



(ft) The much greater teudenry of tliese compactly tufted growths to devtlop in 

 early Hjiring from winter buds and to appear all over the tree. 



(c) A smaller tendency to develop sprouts upon the trunk and main limits. 



(d) The absence of premature fruit. 



(e) The general early fall of leaves and fruit on affected trees, the fruit being small, 

 yellowish green, and more or less shriveled and gummy. 



(/) Gummosis of the roots. 



{g) The occurrence of the disease in plums. 



(ft) The mncli more speedy destruction of affected trees. 



(2) The disease is virulently contagious, and it is probable that something might 

 be done toward diecking its increase by tlie prompt destruction of all affected trees. 

 I'liis should be done in early spring, as soon as the disease a]>jiears and liefore the 

 leaves begin to fall. 



(3) The disease may exist for a short time in jiart of a trcf witliont being in the 

 rest of it, but it soon involv«'S the entire tree. In other words, it woubl sfcm that 

 the cause of the disease must enter the tree at some particular point or points and be 

 carried gradually to all parts through the circulation. 



(4) As in peach yellows, tlie admitted fact that nrighboring trees are in)t always 

 the next to take the <lisease is no argument against its communicable nattire. 



(.5) This disease has gained a strong foothold and is on the increase, especially in 

 that part of (Georgia known geologically as the Arclia'an. 



(fi) If Georgia ])ea<h growt-rs would save their orchards and maintain the success- 

 ful cultivation of the peach, the necessity for ])rumpt ami concerted actitm aitpeirs 

 to be very great. 



WEATHER BUREAU. 



Monthly Weatiiek Review, Vol. xix, Xos. 7, 8. and n. .Mly, 

 At'GI'st, and Skptkmhkh. ISOI (pp. ir>.")-L'.'?2), — The oiigiu of tlie 

 data from which thi.s publiration is prepaied is thus descrihed in the 

 introduction of the July number, though the number of ob.*;ervers 

 varies somewhat from month to month: 



This review is based on reports for July, 1891, from 2,402 regular and voluntary 

 observers. The.se reports are classified as follows: One Inunlred an<l sixty-three 

 reports from the Weather Bureau stations; 118 reports fnmi United States Army post 

 surgeons; 1,.54.5 monthly reports from State we.ither service and voluntary obsiTvers; 

 33 reports from Canadian stations; 179 rejtorts through the Central Pacific Kailway 

 Company; 364 marine reports through the cooperation of the Hydrograjihic OfJice, 



