76 VEGETATION OF A DESERT MOUNTAIN RANGE. 
minimum temperatures at the several stations are the only ones that 
have been used, and they have been in all cases compared with the 
minimum for the same period at the Desert Laboratory. The average 
differences between the minima of the mountain stations and those of 
the Laboratory are shown in table 18, and it is these differences that 
TaBLE 14,—Daily imum and minimum temperatures at Marshall ria (7,600 feet) and 
at the Desert Laboratory for June, July, and August 19 
June. July. August. 
Day 
aa Minima. Maxima. Minima. Maxima. Minima. Maxima. 
M.G.| D.L.|M.G.| D.L.|M.G.| D. L.|M.G.| D. L.|M.G.| D. L.|M.G.| D. L 
Nba a < Mh a Cag eee Waser eaereolbar aes OS lesssna 81 51 76 Bl eivrous 
Dh xiaseiciares| se vase re tall petiatdew'st [2h tee eas caaaesee 48 65 74 83 52 81 TE sissies 
BO esa: 5 ss [hea ig’ se saya Moraceae [faa adobe] nd cindcass 46 69 64 95 48 V7 80 106 
Qi Raden hewleee be We a Phe eb a S ERS 73 70 100 45 76 83 103 
Sth... ;.s:clesnsectlans we <less earaleoreesfisaaaes 78 67 103 48 74 BL lewsace 
Gthincss's | eciachiwatalsaciioel Seance 46 80 67 98) | csccccch aren dlomiias 103 
SUM, 22 cas asicscisnce reversed sag [ dc artvicdos| lip cand cache fiasseve- ona Le korsuanamsuall oeweee ooulllaay-fice ane 48 80 64 lke d 
8th..... 48 75 77 OG. fives ocliaeana ea dee elecs eee 50 80 44. lnieas 
9th..... 48 1G: (il Scenes 108. Vickuyseltecasa eae colersd we 48 74 78 91 
10th..... 44 73 79 104 eetialmuee| Geek oelees ee 50 76 74 94 
llth..... 46 76 67 97 52 73 62 92 48 77 73 89 
12th..... 48 73 66 96 49 73 73 98 50 79 70 102 
13th..... 49 77 59 Be |cksnsutcuwn aahoveses saaeey 50 78 75 105 
14th..... 41 74 70 GS Lovuxenleaedtvieeee dal nenees 49 76 76 107 
165th..... 41 74 74 OP lesnedlaes (oilseed eas 54 81 81 110 
16th..... 4l 70 76 98 2 80 73 102 52 82 74 109 
i lef. eer Deere 69 |gssxce 102 51 71 65 92 52 73 71 107 
18th..... 39 71 79 WG |ovceud| oeeees 63 95 49 73 74 105 
TOK aac 40 81 74 101 54 76 64 97 50 79 76 107 
20th..... 41 73 72 99 52 79 64 94 49 71 75 100 
Plots vss 41 75 81 106 52 74 65 94 52 68 63 88 
22d 41 78 81 104 48 71 70 99 61 69 61 93 
23d..... 40 73 83 104 49 76 66 101 46 67 62 94 
PAth.. cee 46 76 83 106 50 78 63 100 48 MA Vesacdulledacoee 
25th..... 49 73 85 105 49 76 65 PL lecosenheweyeotiacadnhex sed 
26th..... 43 73 85 108 53 78 6l | 86 bissaccleveusapreress|ss<ies 
Bi tlhe as es 48 75 84 108 47 67 GF | BO liccassleeewalenenetii wes 
28th..... 52 78 84 108 53 72 FSB lecexedlesscdc|connws aenadslns as oo 
29th..... 46 78 76 100 53 76 O67 FTOO lo icevclencevs|eseecnines oes 
BOG. eec2e[eweeress 14 Newesas 86 52 78 FB | 104 [ors ce few cco sfe ween clon enee 
Sletivcccsde vonnali ceman [Rosas dloneees 50 V7 Bo lesces lp vuneelseneseeawanelleadeed 
Average ° ‘0 ° ° ° 0 
Feral 21 days, 30.5°| 20 days, 25.0°| 20 days, 24.1°| 21 days, 29.4°| 23 days, 26.1°) 17 days, 27.3 
have been used in the construction of the graph in figure 16, which 
shows the gradient for the Santa Catalinas, the average gradient for 
17 mountain ranges in different portions of the world (according to 
Hann), the gradient for Pike’s Peak, the Sierra Nevada, and also the 
gradient in the free air, as determined at the Blue Hill Observatory. 
