Desmids. WOLLE. Desmids of the United States.--Bethlehem, Penn. The red and brown algæ are partially described in FARLOW'S New England Algæ. Report of United States Fish Commission, 1879.--Washington. The _Characeæ_ are being described by Dr. F. F. ALLEN of New York. The first part has appeared. The literature of the fungi is much scattered. FARLOW and TRELEASE have prepared a careful index of the American literature on the subject. Mosses. LESQUEREUX and JAMES. Mosses of North America.--Boston, Casino & Co. BARNES. Key to the Genera of Mosses.--Bull. Purdue School of Science, 1886. Pteridophytes. UNDERWOOD. Our Native Ferns and their Allies.--Holt & Co., New York. Spermaphytes. GRAY. Manual of the Botany of the Northern United States. 6th edition, 1890. This also includes the ferns, and the liverworts.--New York, Ivison & Co. COULTER. Botany of the Rocky Mountains.--New York, Ivison & Co. CHAPMAN. Flora of the Southern United States.--New York, 1883. WATSON. Botany of California. INDEX. _Acacia_, 209. _Acer_, _-aceæ_. See "Maple." Acetic acid, 3, 59, 98, 138, 230. _Achimenes_, 218. _Acorus_. See "Sweet-flag." Actinomorphic, 213. Adder-tongue, 116; Fig. 70. See also "_Erythronium_." _Adiantum_. See "Maiden-hair." _Adlumia_. See "Mountain-fringe." _Æsculinæ_, 199. _Æsculus_. See "Buckeye," "Horse-chestnut." _Aggregatæ_, 222. Alcohol, 5, 31, 55, 83, 230, 233. Algæ, 4, 21. green, 21. red, 21, 49. brown, 21, 41. Alga-fungi. See "_Phycomycetes_." _Alisma_, _-ceæ_. See "Water-plantain." _Allium_. See "Wild onion." Amaranth, 185. _Amarantus_, _-aceæ_. See "Amaranth." _Amœba_, 7; Fig. 2. _Ampelidæ_. See "Vine." _Ampelopsis_. See "Virginia creeper." Anatomy, 3. gross, Implements for study of, 3. minute, Implements for study of, 3, 4. Anatropous, 151. _Andreæaceæ_, 99, 100. Andrœcium, 148. _Andromeda_, 211. _Anemone_, 185. _Angiocarpæ_, 84. Angiosperm, 129, 143, 145. Aniline colors, 233. _Anisocarpæ_, 210, 213. _Anonaceæ_. See "Custard-apple." Anther, 148, 175, 179. Antheridium, 27, 36, 39, 45, 51, 59, 68, 89, 96, 106, 122. _Anthoceros_, _Anthoceroteæ_, 91; Fig. 57. _Aphanocyclæ_, 185, 196. _Aplectrum_, 167; Fig. 90. _Apocynum_, _-aceæ_. See "Dog-bane." _Apostasieæ_, 164. Apple, 145, 171, 206; Fig. 114. Apricot, 207. _Aquilegia_. See "Columbine." _Aralia_, _-aceæ_. See "Spikenard." Archegonium, 89, 97, 105, 122, 133, 140, 144. Archicarp, 138, 145. _Arcyria_, 13; Fig. 5. _Arethusa_, _Arethuseæ_, 166; Fig. 90. _Argemone_, 191. Aril, 189. _Arisæma_, 78, 157; Fig. 86. _Aristolochia_, _-aceæ_, 224. Aroid, _Aroideæ_, 157. Arrow-grass, 167. Arrowhead, 167; Fig. 91. Arrowroot, 163. _Asarum_. See "Wild ginger." _Asclepias_, _-daceæ_. See "Milk-weed." _Ascobolus_, 71-73; Fig. 43. culture of, 71. spore fruit, 71. archicarp, 71. spore sacs, 72. _Ascomycetes_, 65, 66. Ascospore, 66. Ascus, 66, 69. Ash, 218; Fig. 122. _Asimina_. See "Papaw."