“Plantæ Wrightianæ,” 389, 391, 392, 393, 406. Plants, introduced, 313, 325. Platanthera flava, 509. Plukenet, plants of, 146, 150. Podophyllum Emodi, 175. Poiret plants, 176. Politics, American, 755. Pollen tubes, 325. Pope, Gen., 770. Pöppig, E. F., 267. Porto Rico collection, 702. Portrait, crayon drawing of A. Gray, 94; bronze, St. Gaudens, 752. Potamogeton, 350. Potato introduced, 5. Pourtalès, 719. Powell, Baden, 464. Presl, K. B., 223. Prestele, 330, 340, 344, 362. Prestwich, 802. Price, B., 802. Priest, Dr., 13. Pringle, C. G., 727, 782. Pursh, F., 111, 734; herbarium of, 22. Pusey, 737. Putnam, G. P., 23, 142, 143, 152, 265. Putterlich, A., 214. Pylaie’s, De la, herbarium, 173. Pyxidanthera, 304. Quarter-millennial of Harvard College, 789. Quekett, E. J., 129, 130, 140. Quercus alba, var., 672. Quincy, President, 27, 283, 293. Raffles, T., 86. Rafinesque-Schmaltz, S. C., 278. Ranunculaceæ, 344. Ranunculus hydrocharoides, 408. Ravenel, 745. Rayleigh, Lord, 805. Reade, 137. Rebellion, 465, 467, 469, 470, 471, 478, 480, 481, 483, 486, 487, 490, 494, 495, 496, 503, 506, 511, 512, 518, 522, 526, 528, 533, 535, 537, 538, 554. Reconstruction (of United States government), 544, 549, 554. Redfield, J. H., early impressions of A. Gray, 31; letters to, 659, 686, 697, 701, 775, 811. Redfield and Canby, letters to, 712, 723. Reichenbach, H. Gottlieb, 267. Reichenbach, H. Gustave, 811. “Religion and Science,” Yale lectures, 693. Religious views, 320, 321, 396; influence on Evolution, 751. Requien, E., 184, 185. Resignation of Professorship, 621, 624, 634, 635, 640, 641, 643. Reuter, G. F., 26, 590. Rhamnus Parviflora, 307. Rhexia Virginica, 478, 484. Rhizoma, enlargement of, meaning, 52. Rhododendron, 315, 692. “Rhynchosporæ, Monograph of North American,” 19, 31, 60. Riaño, 704. Rich, W., 21. Richard, A., 24, 164, 400, 540. Richard, L. C., 24. Richard’s herbarium, 173, 178. Richardson, Sir John, 110, 112, 364. Richardson, Dr., 762. Riocreux, 330. Ripley, Mrs., 289. Robbins, J. W., 686. Robinia, 509. Robinson, 123. Roemer, 373. Roeper, J. A. C., 700, 716. Rogers, Mrs. H., 6, 787. Roget, P. M., 113, 118, 129. Rolleston, G., 595. Romane, 742. Roscoe, H. E., 807, 808. Roscoe, W., 808. Rosse, Lord, 384. Rothrock, J. T., 485, 488, 530, 531. Royal Society of London, 112, 127, 754. Royer, Mme., 498. Royle, J. F., 112, 151. Rugel, 311. Rugel’s New Holland Collections, 215. Rutosma, 361. Saccardo, P. A., 718. Sandwich Island plants, 90. Sandys, 800. Santa Barbara, reception at, 768. Saporta, 685, 807. Sargent, C. S., 645, 681, 682, 686, 688, 728, 729, 786. Sarracenia, 642, 646, 647. Sartwell, 172. Saturday Review, 479. Sauquoit, 2-5. Saussure, 719. Savi, G., 194. Saxifraga Careyana, 689, 691. Schimper, W. P., 374, 697. Schinus molle, 568, 763. Schkuhr, C., 26, 267. Schlechtendal, D. F. L. von, 26, 267.