2 WILLIAM PATTEN. 



p. 18. Shape, structure; central gangliou-cells ; non-glandular nature of 

 the buds; lumen of the buds; chitiuous tubule; cuticular canals; nerve- 

 supply, p. 22. Lateral olfactory nerves ; origin, course, distribution, 

 structure ; lateral olfactory ganglion. Median olfactory nerve, p. 22. Struc- 

 ture, distribution, termination in buds. Problematical organs. 



B. Physiology of the Olfactory Organ, p. 26. Absence of reflexes 

 on stimulation with food, ammonia, &c. ; stimulation with electricity; nature 

 of reflex in the males ; same in females ; function of the organ ; effect on 

 males on excising the organ. 



C. The Development of the Olfactory Organ, p. 29. Primitive 

 olfactory thickenings ; origin of the ganglion in the lateral olfactory nerve ; 

 origin of definitive olfactory organ, p. 30. Origin of median olfactory nerve; 

 origin of olfactory lobes. 



D. Relation of Primary Olfactory Organ to segmental sense 

 organs ; to lateral eyes of scorpions ; to frontal organ of Phyllopods ; cause 

 of change of function, p. 32. 



III. GusTATOKY Buds of the Inner Mandibles, p. 33. 

 Position and structure of those in the inner mandibles ; eS"ect of various 

 reagents. 



IV. Temperature Sense. 

 Experimental demonstration of the same, p. 34. 



A. Experiments showing course of temperature impulses; section of 

 tegumentary nerves ; of spinal cord ; longitudinal median section through 

 hind brain and vagus region ; section of left crus ; of both crura ; tem- 

 perature centre in the fore-brain ; supplementary centres in legs, p. 36. 



B. Position of Gustatory Centre, p. 39. 



C. Structure of Temperature Organ, p. 39; probably much the 

 same as the gustatory buds. 



D. Use of temperature sense, p. 39. 



V. Tactile Sense, p. 40. 

 VI. Summary and Comparison. 



Structure and nature of sense organs, p. 40 ; innervation; multiplication by 

 division; comparison with Gephyreans, Galeodes, Mutilla. Very wide dis- 

 tribution of the sense buds, their specialisation as isolated organs, and their 

 fusion to form complex aggregates. 



Part II. — The Morphology of the Arthropod Brain. 

 I. The Brain of Insects and Myriapods, p. 43. 

 A. Structure of Cephalic Lobes: fore-brain; mid-brain: their dif- 

 ferent origins, p. 46. 



