These readings, although few in number, clearly indicate a higher 
relative humidity for the altitudes above 900 meters. This bears out 
the observations which have repeatedly been made that the stations above 
900 meters were often in mist, whereas those below were not. The 
following temperature readings were made simultaneously at different 
altitudes : 
Taste XNII.— Temperature at different altitudes on Mount Mariveles, 
Altitude. 
1905. Hour. ack. | Bans eae | | 
640 | 914 ~~ 1,066 1,250 | 
| meters. | meters. meters. | meters. | 
ae ~ | scat |_ 
MOOR We ten ae cet Gens uk bunseeead -conee seas sais 9.00 a.m; | 21.27) Id2oec co eat 
LIS BO reais ml OOM Ol <2). d Meee ea eee eae 
| } 
MBS Devan oe Oe ea tae wp aectesscauewascees fot BO fale ee! = IB B lu een ee | eater (eee 
12,30 Pumper e248 |. © 20.6 |------4-.- ee eee ee | 
AIR Oey oan te as ey eae a S30 Aes eee) 000 21.4 ts uene epee mn lees | 
RN De is Se At A> 1 ee (eee arn 
HO CES SE aap eee ference Sareea en S00-B.IResigateesO |} 21.6 |nd anne] eae 
| SA weet eee | 2008 fee 
ADT Oi Se eect he Soc ce eee 8.20 a.m. | v1 FB Sena rare 
Pe ees are, rs Ce raas | 19.6 
Ot Ge went ne hata oe Ste 2 .---| 1.30 p.m. 21.6 one eee 
POU DE ea kot | cn te sienneairetacmeunn| emacs <t—c-- 
NIC Teac ak eee hee ee — 9.00 a.m. SOAS Wee 25 54 Se 
| 10.00 a.m. + 1G eg a 
5 RS OE eae ee Re ee: 8.30 a.m. he Pal ae 
Bess 0 Sale 8 aS | See | 21.5 
AVarage o's T6eaAQings. -_- 4. sce bee eee aes Ss ee ee Dee 
Ayarage of 6 readings -...............ccascumsoanqennt "Gee = 5 ames 21.1 | Beas Hee | 
Average of 2 readings ___- kk See eo eee ee | a, eae FE Arian SE | 20.5 | 
. ‘ 
Unfortunately, no readings were obtained for the early morning 
hours during January or February, so that the minimum temperature 
on the mountain can not be ascertained. The lowest reading for 
February at Station 3 (640 meters) is 17°.8 C. The greatest difference 
in temperature observed between the station at 640 and that at 1,250 
meters is 3°.6. If this same ratio had obtained when the reading 
17°.8 C. was taken at the 640-meter station, then the temperature 
would have been 14°.2 C. at 1,250 meters. To judge from the above 
calculation it is probable that the temperature of the top of the moun- 
tain does not fall much, if any, below 14°, and it should be noted that 
this is far above the danger point for tropical plants, because Molisch * 
has shown that members of the Gesneriacew, which belong in this class, 
died only when a temperature of between 2°.5 C. and 4°.4 C. was reached. 
The margin between 14° C. and 4°.4)C. is certainly a wide one and even 
though it be true that the temperature on the top of the mountain 
may fall below 14° while the minimum for the existence of tropical 
* Molisch, H.: Das Erfrieren von Pflanzen bei Temperaturen iiber dem Eispunkt, 
Sitzungber. Akad. Wiss., Vienna (1896), 105, part 1, 82 to 95. 
