WOEKS OF EEFEEENCE 397 



49. Bumpus. — " A Laboratory Course of Invertebrate Zoology," 

 Providence, 1892. 



50. Claus and Sedgvpict. — See No. 18 this list, vol. i. 



51. Davis. — "A Text-book of Biology," Philadelphia, 1888. 



52. Foster. — "A Text-book of Physiology," five volumes. Sixth 



edition, New York, 1893. Introduction. 



53. Griffiths. — " Physiology of the Invertebrata," London, 1892. 



54. Howes. — See No. 9 this list. 



55. Huxley. — See No. 21 this list. 



56. Huxley. — Lecture on a " Piece of Chalk " in "Lay Sermons, 



Addresses, and Reviews," New York, 1871. Also Lect- 

 ure on " The Physical Basis of Life," in same. 



67. Huxley and Martin. — See No. 10 this list. 



58. Lang. — See No. 22 this list. 



69. Lankester. — See No. 42 this list. 



60. Leidy. — " Fresh - water Rhizopods of North America," in 



" U. S. Geological Survey of the Territories," vol. xii., 

 Washington, 1879. 



61. Marshall and Hurst.— See No. 12 this list. 

 61a. Morgan. — See No. 22a this list. 



62. Packard. — See No. 24 this list. 



63. Parker. — See No. 44 this list. 



64. Rolleston and Jackson. — See No. 25 this list. 



65. " Standard Natural History." — See No. 26 this list, vol. i. 



66. Thompson. — See No. 27 this list. 



PAEAMECIUM 



67. Brooks. — See No. 48 this list. 



68. Bumpus. — See No. 49 this list. 



69. Claus and Sedgwick. — See No. 18 this list. 



70. Huxley.— See No. 21 this list. 



71. Kent.— See No. 40 this list. 



72. Lang. — See No. 22 this list. 



73. Lankester. — See No. 42 this list. 



74. Marshall and Hurst. — See No. 12 this list. 

 74a. Morgan. — See No. 22a this list. 



75. Packard. — See No. 24 this list. 



