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180 GRABER, V. : Grundlinien zur Erf orschung des Helligkeits- und Far- 



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181 GRABER, V. : Ueber die Helligkeits- und Farbeneinpfindlichkeit einiger 



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182 GRABER, V. : Thermische Experimente an der Kiichenschabe (Peri- 



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183 GROOM, T. T., and LOEB, J. : Der Heliotropismus der Nauplien von 



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184 GROSS, A. 0.: The Reactions of Arthropods to Monochromatic Lights 



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185 HABERLANDT, G. : Ueber die Perzeption des geotropischen Reizes. 



Ber. bot. Ges., 1900, xviii, 261-272. 

 18 <5 HADLEY, P. B. : The Relation of Optical Stimuli to Rheotaxis in the 



American Lobster (Homarus americanus,) . Am. J. Physiol., 1906, 



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 187 HADLEY, P. B. : Galvanotaxis in Larva3 of the American Lobster 



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 iss HADLEY, P. B. : The Reaction of Blinded Lobsters to Light. Am. J. 



Physiol., 1908, xxi, 180-199. 



189 HADLEY, P. B. : Reactions of Young Lobsters Determined by Food 



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190 HARPER, E. H. : Reactions to Light and Mechanical Stimuli in the 



Earthworm, Perichceta bermudensis (Beddard). Biol. Bull., 1905, 

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101 HARPER, E. H. : Tropic and Shock Reactions in Perich&ta and Lum- 

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192 HARPER, E. H. : The Geotropism of Param^ecium. J. Morphol., 1911, 



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193 HARPER, E. H. : Magnetic Control of Geotropism in Paramcccium. 



J. Animal Behav., 1912, ii, 181-189. 



104 HARRINGTON, N". R., and LEAMING, E. : The Reaction of Amceba to 

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195 HASEMAN, J. D. : The Rhythmical Movements of Littorina littorea 



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196 HAUSMANN, W. : Die photodynamisehe Wirkung des Chlorophylls 



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197 HELMHOLTZ, H. : Handbuch der physiologischen Optik. Hamburg, 



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198 HENRI, MME. V., and HENRI, V. : Excitation des organismes par les 



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