Gollum hisses – definitely low.  Spiders hiss – definitely low.  Dwarves hiss in a stumbling about scene, also tagged “low”.  In Chapter 14, however, the hisses are of dragon-fired arrows and bits of building falling into the lake.  Same word, much more weighty feeling.  I shall have to find a way to tag those two instances as “high”.

• 05.014 and hissed:
• 05.016 when the hiss came
• 05.022 Sssss’ said Gollum,
• 05.025 So Gollum hissed:
• 05.032 he hissed.
• 05.036 Ss, ss, ss,’ said Gollum.
• 05.036 Ss, ss, ss,’ said Gollum.
• 05.036 Ss, ss, ss,’ said Gollum.
• 05.036 Sss, sss, my preciouss,
• 05.036 Sss, sss, my preciouss,
• 05.041 He hissed to himself,
• 05.043 my preciouss – ss – ss.’
• 05.043 my preciouss – ss – ss.’
• 05.045 teaching his grandmother to suck – ‘Eggses!’ he hissed.
• 05.048 After a while Gollum began to hiss
• 05.064 not fair!’ he hissed.
• 05.066 S-s-s-s-s,’ hissed Gollum.
• 05.066 S-s-s-s-s,’ hissed Gollum.
• 05.070 S-s-s-s-s,’ said Gollum
• 05.073 He hissed
• 05.082 hissed Gollum.
• 05.097 Then suddenly out of the gloom came a sharp hiss.
• 05.101 The sound came hissing louder
• 05.105 he heard the hiss loud behind him,
• 05.106 The hiss was close behind him.
• 05.109 curse it!’ hissed Gollum.
• 05.117 Ssss, sss, gollum!
• 05.117 Ssss, sss, gollum!
• 05.120 hissing
• 05.124 Ssss!’
• 05.127 He hissed softly but menacingly.
• 05.130 There was a hissing
• 07.101 The grasses hissed, their tassels bent,
• 08.081 and hissing,
• 08.085 hissed a fourth;
• 08.091 hissed the angry spider climbing back onto the branch.
• 08.109 and hiss:
• 08.123 and hissed out horrible curses;
• 13.016 Sh! sh!’ they hissed,
• 14.013 and hissing into the lake.
• 14.024 There was a hiss,

What do we think?  Is “sss” a different word from “hiss”?  Probably.  We will have to revisit this word.