. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. 750 KBFORTâ ^ii. in the retinas of deep-sea fish, which may conceivably help to-\vards physiologieal conclusions as to the functions of tlie various components. Witli regard to the all- important question of the nature of the light undoubtedly present in the dwp sea it is liardly possible to accept Professor Verril's recent startling suggestion tlmi sm-' light pe
. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. 750 KBFORTâ ^ii. in the retinas of deep-sea fish, which may conceivably help to-\vards physiologieal conclusions as to the functions of tlie various components. Witli regard to the all- important question of the nature of the light undoubtedly present in the dwp sea it is liardly possible to accept Professor Verril's recent startling suggestion tlmi sm-' light peiKjtrates to the greatest depths with jierhaps an intensity at from ii,(JOO tj 8,000 fathoms equal to that of some of our partially moonlight nights. Such a con- jecture is entirely at variance with the results of all experiments on the peuetratiun of sea-water by sunlight as yet made by physicists, results which hiivn prevented other naturalists from adopting this solution of the probltuu. The progress of research by on the deep-sea fauna confirms the con- clusions early formed that it is impossible to determine any successive zones of di>pth in the deep-sea regions, characterised by the presence of special groups ^ii animals. Within the dee])-sea region the contents of a trawl brought up from tb'; bottom give no evidence which can be relied on as to tlie depth at which tlie bottom lies within a range of at least 2,500 fathoms. Some groups of animals appear tobecharacieristicof water of considerable ilepth, but representativesof them striitrijle np into much shallower regions. Thus of the remarkable order of liolothurians Elasipoda nearly all tlie representatives occur at very considerable dt iths, nnd their numbers diminish sliorewards, but one has been found in only lUU ikthnms, Again, the range upwards into about .'300 fathoms, and the Phorniii- somas, which Loven considers as eminently deep-sea forms, range up to a littV over 100 fathoms dep
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1885
