20. The first snake is seen, _Coluber trivittata_, Raf. Also a beautiful large butterfly, red and black. The _Salix vitellina_, and _Capsella bursa_. (_Thlaspi bursa-pastoris_,) are in blossom. 21. Found in blossom, near Gray's Ferry, _Narcissus pseudo-narcissus_, and _Sedum ternatum_, both naturalized. Likewise the _Populus tremuloides_, and _Mespelus canadensis_. The leaves of _Podophyllum pettatum_ are fully expanded. 23. Seen in full bloom in gardens, the pear-tree, plum-tree, _Riber grossularia_, and _R. rubrum_. 24. Found in blossom along the Schuylkill, _Aguilegia canadensis_, _Hyacinthus botryoides_, _Ranunculus fascicularis_, _Violapapilionacea. V. decumbens_, Raf., _Houstonia cerulea_, _Cerastium pumilum_, Raf. 25. Found in blossom near Cambden, _Viola pedata_, _V. lanceolata_, _V. ovata_, Raf., _V. primulifolia_, _Arabis parviflora_, Raf., _Cerastium pumilum_, Raf., _Carex acuta_, _Meopilus botryapium_, _Laurus sassafras_, _Cercis canadensis_, _Potentilla simplex_, _Andromeda racemoca_. 28. Seen in blossom in gardens, _Calycanthus floridus_, _Syringa persica_, _Phlox pilosa_, &c. The leaves of _Liriodendron tulipifera_, _Æsculus hippocastanum_, _Populus fastigiata_, _P. angulata_, are unfolded. 30. In blossom on the Schuylkill, _Obolaria virginiana_, _Anemone trifolia_, _Hydrastis canadensis_, &c. _May_ 1. In blossom in the Neck, _Cerastium vulgatum_? _Veronica serpyllifolia_, _V. arvensis_, _Ranunculus bulbosus_, _Viola cucultata_. 3. Found above the Falls of the Schuylkill, _Viola striata_, _V. concolor_, _V. primulifolia_, _V. blanda_, _Fumaria aurea_, _F. cucullaria_, _Charophyllum procumbens_, _Uvularia sessitifolia_, _U. perfoliata_, _Cercis canadensis_, _Arabis falcata_, _Stellaria pubera_, _Erigeron pulchellum_, _Orchis spectabilis_, _Hydrastis canadensis_, _Dentaria diphylla_, _Azalea nudiflora_, &c. 4. Found on the Vissahikon, _Arabis bulbosa_, _Panax trifolium_, _Viola pectata_, _V. rotundifolia_, _Cardamine pennsylvanica_, _Krigia virginica_, and several grasses. 7. Found in blossom over the Schuylkill, _Laurus sassafras_, _Viburnum prunifolium_, _Aronia arbutifolia_, _A. melanocarpa_, _Fragaria virginica_, _Cerastium nutans_, Raf., _Convallaria majalis_, naturalized, and several species of the genus _Vaccinium_. 10. Found below the falls of the Schuylkill, _Floerkea uliginosa_, _Viburnum acerifolium_, _Oxalis violacea_, _Cerastium tenuifolium, lechoma hederacea_, &c.: and the following above the Falls--_Trillium cernuum_, _Viola pubescens_, _V. pennsylvanica_, _Hydrophyllum virginicum_, _Polemonium reptans_, _Senecio aureus_, _Saxifraga pennsylvanica_, _Staphylea trifoliata_, _Obolaria virginica_, _Caltha palustris_, _Ranunculus abortivus_, &c. 11. Seen the first bat. 12. Near Haddonfield, _Bartsia coccinea_, _Helonias bullata_, _Trifolium repens_, &c.