SUN AND HARVEST OF THE SEA—SCH MITT 311 
JOHNSTON, Hart §. 
1937. Sun rays and plant life. Ann. Rep. Smithsonian Inst., 1936, pp. 353- 
371, 8 figs., 4 pls. 
JOHNSTONE, JAMES. 
1608. Conditions of life in the sea. xiv-+322 pp., 31 figs. 
JOHNSTONE, JAMES, Scott, ANDREW, and CHADWICK, HERBERT C, 
1924, The marine plankton... A handbook for students and amateur 
workers. xvi+194 pp., 20 pls. London. 
MarMER, H. A. 
1930. The sea. 312 pp., 45 figs. New York. 
Mourray, Sir JOHN, and Husort, JOHAN. 
1912. The depths of the ocean. xx-+821 pp., frontispiece, map, 575 figs., 9 
pls. London. 
STETSON, HARLAN TRUE. 
1942. Solar radiation and the state of the atmosphere. Sci. Month., vol. 54, 
pp. 513-528, figs. 1-11. (Also in Ann. Rep. Smithsonian Inst., 1942, 
pp. 151-171, 8 figs., 4 pls., 1943.) 
STEUER, ADOLF. 
1911. Leitfaden der Planktonkunde. xv-+382 pp., 1 pl., 279 figs. Leipzig. 
SvVERDRUP, H. U., JOHNSON, MARTIN W., and FLEMING, RICHARD H. 
1942. The oceans, and their physics, chemistry, and general biology. x-+-1087 
pp. 265 figs. 7 charts. New York. (Contains comprehensive bibli- 
ography in part through 1941.) 
WAILEs, G. H. 
1929. The marine zoo-plankton of British Columbia. Mus. and Art Notes, 
vol. 4,13 pp. Vancouver. 
ZOBELL, CLAUDE H. 
1946. Marine microbiology. xv-+240 pp., frontispiece, 12 figs. Waltham, 
Mass. 
EXPLANATION OF PLATES 
PLATE 1 
Hydroponics installation on Ascension Island, covering 80,000 square feet of 
ground, with windbreaks and sunshades. Center photograph shows the type 
of waterproofed concrete troughs that were built. They were constructed on 
several levels, to facilitate the gravity flow of nutrient solutions from the 
higher to the lower levels. From the lower end of the system the solutions 
were pumped back to the higher level for recirculation, with replenishment of 
nutrient solutions as required. In full production, lettuce, tomatoes, cucum- 
bers, green peppers, radishes, beans, and other greens were raised in quantity. 
(Courtesy Army Air Forces and Purdue University.) 
PLATE 2 
Upper: Sample of diatom-rich phytoplankton in which a number of species are 
represented: Lauderia glacialis, the large disklike forms; Thalassiosira, 
chains of tiny boxlike diatoms, of which a few isolated specimens present 
the circular face view; Chaetoceras, chains of long-bristled, laterally rec- 
tangular cells; Rhizosolenia, stout-pointed rodlike forms; and Thalassiothrin 
nitschioides, slender needles. All these diatoms, either in company or in- 
dividually dominating samples, form verdant oceanic pasturage. X 150. 
Lowrk: Sample of phytoplankton dominated by a single species, Thalassiosira, 
showing also a specimen of Rhizosolenia and one foreshortened disk repre- 
senting perhaps Lauderia. XX 150. 
(Both photographs from Bigelow, courtesy U. S. Fish and Wildlife Service.) 
