Expeditions organized or participated in by the Smithsonian . - submerged,departed for New York, and arrived in Washington June 24. Dr. C. D. ]^Iarsh, of the Bureau of Plant Industry, accompaniedthe survey party to the Canal Zone to make typical collections of theplankton organisms in the fresh waters of the Atlantic and Pacificslopes of the Isthmus. He arrived at Cristobal on January 15. 1912, 72 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6o established liis headquarters at Empire, and remained in the fielduntil February i6. The topography of the Zone is such that it is not a pa
Expeditions organized or participated in by the Smithsonian . - submerged,departed for New York, and arrived in Washington June 24. Dr. C. D. ]^Iarsh, of the Bureau of Plant Industry, accompaniedthe survey party to the Canal Zone to make typical collections of theplankton organisms in the fresh waters of the Atlantic and Pacificslopes of the Isthmus. He arrived at Cristobal on January 15. 1912, 72 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6o established liis headquarters at Empire, and remained in the fielduntil February i6. The topography of the Zone is such that it is not a particularlygood collecting ground for plankton. The region visited is practi-cally destitute of lakes, there are but few pemianent pools, andalthough the lowlands of the Atlantic slopes form a huge swamp,the waters in this locality are so connected that no great variety offorms is found. The south slope is abrupt, with no permanent bodiesof water, and the streams are small and more or less Fig. 79.—Rio Grande Reservoir, Canal Zone, showing workmen clearingthe shores to prevent decaying vegetation from Iallmg into the is an old reservoir dating from the time of the French by Marsh. Especial attention was paid to the old reservoirs which formlittle lakes, and ordinarily would contain some of the typical floraand fauna of the immediate region, but these bodies of water are plankton poor, as compared with similar bodies in a temperateclimate; for, inasmuch as the temperature of the air is practicallyuniform throughout the year, there is no vertical circulation of thewater, except where it is shallow enough to be affected by the conditions at the bottom of the deeper waters of the reservoirsare such as to make life impossible. Careful collections were made NO. 30 SMITHSONIAN EXPLORATIONS, I9I2 73 from all these reservoirs and the streams supplying them, from theembryonic Gatun Lake, its adjacent swamps, and from the waters KALE
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1912
