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acid amplification angular aperture aperture appear axis bacteria balsam bands beads blood blood-corpuscles bodies bright bundles cartilage cavities cells centre cilia colour connective tissue corpuscles crystals delicate described diameter diatoms diffraction disk divergence angle drop eggs embryo examined exhibited experiments eye-piece fact fibres fibrillated flattened fluid focal focus Foraminifera fungi fungus Gasteropod germs give Gladiolus glass hyphae illumination immersion inch instrument length lens lenses light lines measured membrane method micro micrometer Microscopical Society microscopist minute monad mycelium Nobert's nuclei nucular object object-glass observed obtained oogonium oospores optical organs paper particles Peronospora photographs placed plates portion present prism Professor protoplasm rays refraction refractive index resting spores rotifers Royal Microscopical Society Salpa says screw sections seen slide slit solution spaces species specimens stage structure substance surface telescope thickness thin tion tube veliger whilst zooids
Page 117 - ... to cause some sticky exudation, on which the fungus especially thrives. It is not denied that the growth of the fungus greatly aggravates the trouble already existing, by so encasing the leaves as to prevent the action of the sunlight ; we only say, that, in seeking a remedy, we are to look further back than the fungus itself, — to the insect, or whatever it may be, which has made the luxuriant growth of the fungus possible.
Page 124 - This sentence is very erroneous, for although the bodies were apparently rare when I first recorded their discovery, they were not necessarily so in a state of nature, for on continuing the experiments after my first essay was written, the resting-spores were produced in myriads, and that, too, within the tissues of a comparatively few leaves.
Page 300 - Like other marine deposits, this one passes laterally, according to position and depth, into the adjacent kind of deep-sea ooze or mud. The argillaceous matters are of a more or less deep brown tint from the presence of the oxides of iron and manganese. In the typical examples no mineralogical species can be distinguished by the naked eye, for the grains are exceedingly fine and of nearly uniform dimensions, rarely exceeding 0^05 mm. in diameter. It is plastic and greasy to the touch ; when dried...
Page 248 - Ion? been usual to draw between plant and animal organisms, and between the individual groups of those lowest forms of life, appear more and more illusory, and the supposition is recommended of a common lowest kingdom of organisms, that of Protista, (Haeckel,) out of which animals and plants have by degrees been differentiated.
Page 94 - (voL v). lie states that " in order to ascertain, if possible, the cause of the sound that is produced by the sand from Kauai, presented to the Academy at a former meeting, I investigated its structure under the microscope, and I think the facts I have ascertained fully explain the manner in which the sound is produced. As the grains of sand, although small, are quite opaque, it was necessary to prepare them so that they should be sufficiently transparent to render their structure visible. This...
Page 125 - Chronicle, and I am content to let the observations stand on their own merits. Sensibly conducted and extensive field experiments might probably teach some valuable lessons, but it is difficult, if not impossible, for any single individual, whether farmer or botanist, to institute and carry out such experiments.
Page 246 - ... openings, the edges of which are armed with fine projections, forming a rude sieve for the exclusion of dust and dirt. When about to transform into the pupal state, the body contracts into a barrel-shaped form, turns brown and hard, forming a case, within which the larva transforms itself into a pupa. Our house-fly having, as a maggot, lived a life of squalor, immersed in its revolting food, appears after a short pupal sleep of from five to seven days, as a winged being with legs and wings of...
Page 118 - Saprolegniese, because similar bodies are unknown in other families of fungi. The first-named family has jointed threads, the second bears threads without joints ; now as the threads seen by me, and last year illustrated in connection with the resting spores, had jointed threads, they must belong to Peronospora, and not to Saprolegnia.
Page 119 - I preserved the material in which the resting spores were present in sealed bottles, each bottle containing more or less pure water or expressed juice of horse-dung diluted with water. As I was quite in the dark as to the habits of these resting spores, of course I did not know what to do for the best, or what the result of my experiments would be.
Page 120 - B may be seen two resting-spores within one oogonium, and at c three resting-spores within one oogonium, whilst at D is shown a double oogonium — two oogonia coalesced, and each oogonium containing a resting spore. At the end of April and beginning of May last I began to see the first signs of germination, and at this time many of the oospores proved effete ; the oogonium cracked at E, or became broken into atoms, as at F, discharging a bladder, as at o, which perished in fine dust, as at H.