[308] K. Brandt (“Über den Nitratgehalt des Ozeanwassers and seine biologische Bedeutung,” Abh. d. kais. Leop. Carol. deutsch. Akad. d. Naturfoscher., 1915) accounts for this fact by the assump­tion that through the greater activity of the denitrifying bacteria in the tropical waters the amount of available nitrates is here comparatively smaller than in the polar oceans. The writer fully appreciates the importance of this fact but nevertheless is inclined also to see a limiting factor in the enormously rapid decline of the dura­tion of life at the upper temperature limits.

[309] Metchnikoff, E., The Prolonga­tion of Life. New York, 1907.

Transcriber’s note:

A small number of spelling anomalies were noted and these have mostly been corrected, but a few that possibly represent authentic contemporary alternatives have been left unchanged. A [list of anomalies] is given below.

[Spelling anomalies]

Corrections
spermatozoon —> spermatozoön
i.e. —> i. e.
e.g. —> e. g.
nermaphrodite —> hermaphrodite
suceeded —> succeeded
ôf —> of
tryosinase —> tyrosinase
in-as-much —> inasmuch
ultra-violet —> ultraviolet
view-point —> viewpoint
Fredericq —> Frédéricq
Korösy —> Körösy
Sitzngsber —> Sitzungsber
negaceros —> megaceros
Variants
clew/clue
Entswcklngsmech/Entwcklngsmech/Entwicklngsmech
peroxidase/peroxydase (latter spelling in quoted text.)
20° C/20°C (spaced and unspaced temperature specifications)
8vo/8^o (octavo paper size in the publications listed in the end matter)