312 THE BOTANISTS OF PHILADELPHIA. 



60. ''Iron Wood, Hop-Hornbeam." VI : 40. 



61. " Tree Form and Tree Photog^aph5^ " YI : 72. 



62. "Carvatomentosa." VI : 88. 



63. "KockOak, Kock Chestnut Oak. " VI : 104. 



64. "Pin Oak." VI : 121. 



65. "Eed Maple." VI : 137. 



66. " Yellow Birch. " YI : 152. 



67. "Black Birch." VI : 169. 



68. "The Bed Spruce." VI : 184. 



69. "Honey Locust." VI : 201. 



70. "Swamp Magnolia." VII : 8. 



71. "Big White Oaks." VII : 24. 



72. " A Pennsylvania Sequoia. " VII: 24. 



73. "The Black Spruce." VII : 40. 



74. "The Origin of Floral Structures. EevicAv of Rev. George Hen- 

 slow's Book." — The American. 



75. " Some Observations on the Bahamas and Jamaica." — Proceedings 

 American Philosopliical Society, XXIX : 145. 



76. ' 'A Monstrous Specimen of Rudbeckia hirta. ' ' — Contributions Botan- 

 ical Laboratory University of Pennsylvania, I : 3. 



77. "A Nascent Variety of Brunella vulgaris." — Contributions Botanical 

 Laboratory University of Pennsylvania, I : 64. 



78. "A Rare Button wood." — Garden and Forest, III : 69. 



79. "The Action of Root Hairs, Illustrated." — Garden and Forest, 

 III : 94. 



80. " Poisonous Properties of the Leguminoste. " — Proceedings Academy 

 of Natural Sciences, 1877, 274. 



81. "Relation of the Medullary Rays to the Strength of Timber."— 

 Proceedings Academy of Natural Sciences, 1884, 14. 



82. "The Internal Cambium Ring in Gelsemium sempervirens. — Pro- 

 ceedings Academy of Natural Sciences, 1885, 22. 



83. "Mimicry Among Plants." — Proceedings Academy of Natural 

 Sciences, 1888, 12. 



84. " Remarks on Death of Professor Asa Gray. " — Proceedings Academy 

 of Natural Sciences, 1888, 62. 



85. "The Sand Dunes of LeAves, Delaware." — Proceedings Academy 

 of Natural Sciences, 1889, 134. 



