Expeditions organized or participated in by the Smithsonian . ible that local atmos-pheric conditions may have had some influence there, so that whatseems most likely to have been solar changes may possibly have beenof atmospheric origin. To exclude this possibility it is necessary toshow that the same results would be reached by simultaneous obser-vations at another station far from ]\lount \\ilson. NO. I I SMITHSONIAN EXPEDITIONS, I9IO-I9II 7 The station at Washington is nnsuital^le for this purpose becauseclouds so often interfere. A station near the city of Mexico wasproposed
Expeditions organized or participated in by the Smithsonian . ible that local atmos-pheric conditions may have had some influence there, so that whatseems most likely to have been solar changes may possibly have beenof atmospheric origin. To exclude this possibility it is necessary toshow that the same results would be reached by simultaneous obser-vations at another station far from ]\lount \\ilson. NO. I I SMITHSONIAN EXPEDITIONS, I9IO-I9II 7 The station at Washington is nnsuital^le for this purpose becauseclouds so often interfere. A station near the city of Mexico wasproposed and would have been occupied in July, but just as definitearrangements were being concluded the town where the expeditionwas to locate was reported sacked by a war party. As the conditions inMexico seemed likely to remain disturbed for some time, anotherpart of the world was chosen. Considerations of accessibility, favor-able climate, high altitude, and peaceful conditions, seemed to recom-mend Algeria. vSuch of the Algerian observations as have been thus far completely. Fig. 4.—Arab judge. Photograph by Abbot. reduced seem to be very promising and indicate that the expeditionarymeasurements were equally as definitive as those made at the per-manent station on Mount Wilson. Great confidence is felt, that, asa result of the present expedition, supplemented if necessary by thecontinuation of it in , a satisfactory conclusion will be reachedas to the supposed variability of the sun. Returning, Mr. Abbot visited Naples, Potsdam, London, and Faris,for the purpose of comparing the silver disk pyrheliometers furnishedby the Institution to observers in those cities, with a similar instrumentused by the expedition in Algeria. Comparisons were made satis- 8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 59 factorilv in Naples and P^otsdani, but clouds prevented them inLondon and Paris. INVESTIGATION OF THE ANTIQUITY OF MAN IN SOUTH AMERICA In March, 1910, Dr. Ales Hrdlicka, Curator o
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