Essays on
章节目录
共 56 段- An arrangement and description of minute and rare shells.
- Take a small rod[9] of the clearest and cleanest glass you c
- In 1784, M. Æpinus published a description of what he termed
- To render this still plainer, let us divest what has been sa
- As only one side of an object can be viewed at a time, it is
- A DESCRIPTION OF THE MOST APPROVED MICROSCOPES, AND THE METH
- Some capillary tubes, Fig. 12, to receive small fish, and fo
- A B, Fig. 1. represents the body of the microscope, containi
- A B C D E F, Fig. 1, represents the body of the solar micros
- E, the bar which carries the magnifying lens; it fits into t
- A strong light may be thrown on an object various ways: firs
- TO VIEW THE CIRCULATION AND EXAMINE THE PARTICLES OF THE BLO
- Put half an ounce of cochineal, in powder, into half a pint
- [47] The great beauty of the dye produced by the cochineal i
- [52] To some persons the gnat (culex pipiens) is so truly fo
- The thorax is the upper part of the body, it is of various s
- Of bees, it is only the labourers and the queen that have st
- The new organs were under the old ones as in a sheath, so th
- The industry of those that spin cones or cases, in which the
- The tail is constructed and planned with great skill and wis
- As respiration is one of the most important actions in the l
- The females have at first the same appearance with those of
- The following is an experiment of M. Lyonet on the generatio
- The several parts of trees and plants afford a variety of ha
- From one of the most active, industrious, and rapacious; fro
- The reader who is desirous of a fuller information concernin
- The TRACHEAL ARTERIES of the caterpillar are two large aeria
- The insect which comes at present under our inspection is pa
- They have a progressive motion, which is performed by that p
- Several excrescences or buds often appear at the same time o
- The variety that may be observed in these minute animals con
- These little creatures dwell in colonies together, from ten
- Ellis found out by mere accident a method to make their fins
- Leeuwenhoeck was the first who noticed this curious animalcu
- As this animalculum seems to have some affinity with the hai
- These eels are in general of a large size, and may be seen w
- 102. KOLPODA MUCRONATA. K. membranacea dilatata, antice angu
- 148. LEUCOPHRA VIRESCENS. L. cylindracea, opaca, postice cra
- 211. TRICHODA SULCATA. T. ovato-ventricosa, apice acuminata,
- 274. HIMANTOPUS ACARUS. H. ventrosus, postice cirratus, anti
- It has been called the wheel animal, because it is furnished
- The patina is extremely bright and splendid; it has a large
- In roots, the colour of the rind varies very much, being whi
- The most numerous and the largest apertures are generally to
- Ores and minerals afford an immense variety of very beautifu
- The eyes of the spider have been described in page 199, they
- TURBO EBURNEUS. Fig. 15. T. quinque anfractibus ventricosis
- PETROSELINUM MACEDONICUM. Fig. 15 and 16. Bubon Macedonicum.
- “Mankind must necessarily be diversified by various tastes,
- Their habitations are exceedingly diversified: some are foun
- To form a cabinet sufficiently capacious to receive specimen
- Aranea viatica, resembles a crab, moves slow, &c.
- The same ingenious and learned artist applied a lattice of s
- Ox-fly, its proboscis described, 188
- Sets of protracting and plotting scales; instruments for
- V. GEOMETRICAL AND GRAPHICAL ESSAYS. This Work contains, 1.