430° THE POPULAR SCIENCE MONTHLY 
he explored Lake Titicaca and the coast region of Peru and Chile. 
From this time onward until the close of his life exploration was to 
engross more and more of his attention, to the final exclusion of the 
embryological studies that had given color to his earlier years. ‘The 
last publication in which he records the results of the rearing of ani- 
mals is his joint paper of 1889 with Professor Charles 0. Whitman and 
is upon the development of fishes. After 1889 he gave up the raising 
of larve in his aquaria at Newport, and became an explorer, geologist 
and systematic zoologist; although it should be said that the last paper 
published during his lifetime is a short one upon the temporary exist- 
ence of a lantern and of teeth in the young Hchinonéus. It is, however, 
hased upon the study of museum material, and records an observation 
made by A. M. Westergren. 
His remarkable energy and executive ability fitted him in an emi- 
nent degree to be the leader of scientific expeditions. Hach exploring 
trip was planned to a day even to its minute details, every course 
charted, distances measured and every station decided upon, before he 
left his desk in the Harvard Museum, so that all of its achievements 
were actually prearranged. At times it was of vital import to his ex- 
peditions to have supplies of coal brought to some distant island in the 
tropics, but invariably when he arrived his colliers would have pre- 
ceded him, and all went forward with clock-work regularity. In fact, 
before starting he read all that was to be found upon the regions he 
designed to visit so that he was enabled to begin the writings of his 
results the moment the voyage was over. It is due chiefly to his fore- 
thought that in more than 100,000 miles of wandering over tropical 
seas he never met with a serious accident; and this is the more remark- 
able when one considers that in order to land upon the coral reefs he 
was forced to cruise in the hottest season when the brooding calms were 
liable at any moment to break into a hurricane. Day after day I saw 
him remain upon the bridge of the steamer sketching salient features 
of many a lonely coast that he of all naturalists was the first to see. 
The rolling of the vessel caused him acute distress, yet though sea-sick 
he worked on undaunted for the keynote of his character was perti- 
nacity. 
As we have said his first expedition was to South America to ex- 
plore Lake Titicaca and to visit the copper mines of Peru and Chile. 
He published a hydrographic chart of the lake, sounded its depths, de- 
termined its temperature, collected its animals and plants, and relics 
of the ancient Peruvians who once lived upon its islands. Among other 
results he found at Tilibiche, Peru, a reef of fossil corals elevated 
2.900—3,000 feet above the sea and 20 miles inland from the ocean, 
thus showing that the recent elevation of some parts of the western 
coast of South America has been even greater than had been observed 
by Darwin. 
