14 ANNUAL REPORT OF THE 



and psychrometer comparisons were made, and a full set of in- 

 structions was prepared, especially adapted to the needs of the 

 observers at the various stations. A study of cloud movements 

 was carried on at the Harvard College Observatory at Arequipa, 

 the results of which are to be published in the " Meteorologische 

 Zeitschrift " ; special studies were made of the dust whirls, and of 

 the mcdanos (crescentic dunes) of the desert. Some experiments 

 in kite building, for the meteorological investigation of the free 

 air, were carried on as well. The physiological effects of the 

 high altitudes of El Misti, and of the Galera Tunnel (15,655 

 ft.) on the Oroya Railway, were studied ; some sphygmograph 

 curves obtained on El Misti have been reproduced in the " Journal 

 of the Boston Society of Medical Sciences" (June, 1898), being 

 the first curves from so great an altitude that have been reproduced. 

 Mr. Ward made regular meteorological observations several times 

 a day throughout his trip, the records obtained at sea being re- 

 ported to the U. S. Hydrographic Office. Hourly observations 

 of the surface temperatures of Lake Titicaca were made during 

 two trips across that lake. 



On returning to Cambridge, the course in Climatology previ- 

 ously given in the first half year was given in the second half 

 year, so that Mr. Ward's absence caused no decrease in the 

 amount of instruction offered in meteorolog} r and climatology. 

 The additions to the laboratory materials for use in meteorology 

 and climatology made during the last half year have been a large- 

 scale colored chart of mean annual isanomalous temperatures, a 

 considerable number of diagrams enlarged for class use from text- 

 book figures, and some three dozen lantern slides of meteorological 

 phenomena. 



Mr. Curtis has continued his work on the Harvard Geographical 

 models, being chiefly engaged in making copies from the originals, 

 for sale to various colleges and schools. The work thus became 

 nearly self-supporting. The utility of the models being shown, 

 Messrs. Ginn and Company have now undertaken the publica- 

 tion of the models, the work of casting and coloring being in the 

 hands of Messrs. Paul Vogt and Sons of Boston. It is hoped that 

 the three models already prepared may be only the beginning of 

 an extended series. 



Two courses have been given in the Summer School of 1898, a 

 general course on Elementary Physiography, and the Physiography 



