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azid Canada go1l1,nrod. '76 -ut thoe species In the VAriablo category becanse w have rweords whioh definitely sn~tain it. In mAdIltion, we have the i=esjin that an asters, oakti hicknrlejo poplars and. willows likewise display wide variabilityg f*01u4d ixW, a.ll proportion of extra early individuals. We suspet that extra early individuals teioresnt genetlal, rather than en vi t variations for th foll-viig reawsnas (1) In ARals lik the ragweds, we have never found extra early lants twie In the sags place. (2) In white amrooto at both stations, the very earlieit blooms for tbree year have occrred at two partlclmar spots, both on a orth slope a shaded. Te two sites would seem to be old rathenr than w. (3) In chioO , at the Da station# the earliest bloo= for the last thme yars has occurred at a partioular spot on a north slope which seems cooler than the usual "aurbtae habitat of this spoioee I)) n willows and suma earliness and lateness seem to show a clonal 4istrWi- tion. At the Juntion of two cloes on. can see wide disparity in earli- ss en identical site.
Comprison 39twn ations Tew 4ates of devlopmntal pezimea aire inflxnced by latitude, lonugituto an altitude, TM direction and magntude of these factors is erpressel, in ass data, byH oiAl l, wich a56tS tIhnt '*Other conditions bein eqxxa the fin the tim of occrrence of a given ertodial event in life aotiviti In t te North Amsioa is at too g esal aege rte of four das to each degree of latite, five degrees of longitude* and b0 feet altitude, later north'- wd, eastward, and urward in the sprin and early' m ,ur.* (11IT). Our tables offer a suitable variety of events for a mass comparison with Hoplnb law, but the distanoe between the two stations is too a1 to be advantaous for this mrpos, Nevertheless, as %bitins points mut, his forM11. my be used not only to pedict the averW differene between localities, bt to evaluate the intensity of the local fators which cause local deviations from the law, 'lrom this wiewpoint a comperison of our two stations is worth oakcig. 1 lblg 2#A V. e exclude all of our anlual data, because of th dif iJt, alread explained, of Interpolating animl dates between weekly visits to the B station. We include all pars of plant dAtes in which a given plant event rau recorded at bota stations uring the sam year, Thre are 241 smah pAirs from April to Jue imlusive, and 96 in July amd Auust, a tot1 of 337. Bemse bOPkIns sPoiffie epring an early swwarO it seems advisable to s to the midm data,. W e ~de all ite a la rsharness, such a ddinw, ripning -,f fruit, and harvesting of crops, That re=Ana is entirely dates of first bloom&